another bulk of composer updates

(cherry picked from commit 6685381fd8db507493c3d7c1793f8c05c681bbce)

20 files changed, 499 insertions, 237 deletions

diff --git a/vendor/sabre/event/.gitattributes b/vendor/sabre/event/.gitattributes
new file mode 100644
index 000000000..0fdd4b01c
--- /dev/null
+++ b/vendor/sabre/event/.gitattributes
@@ -0,0 +1,2 @@
+/examples          export-ignore
+/tests             export-ignore
diff --git a/vendor/sabre/event/.travis.yml b/vendor/sabre/event/.travis.yml
index b6719f591..020488b79 100644
--- a/vendor/sabre/event/.travis.yml
+++ b/vendor/sabre/event/.travis.yml
@@ -1,13 +1,8 @@
 language: php
 php:
-  - 5.5
-  - 5.6
-  - 7
-  - hhvm
-
-matrix:
-  allow_failures:
-    - php: hhvm
+  - 7.0
+  - 7.1
+  - 7.2
 
 env:
   matrix:
diff --git a/vendor/sabre/event/CHANGELOG.md b/vendor/sabre/event/CHANGELOG.md
index 9d6d7cfaa..5b1fb2e68 100644
--- a/vendor/sabre/event/CHANGELOG.md
+++ b/vendor/sabre/event/CHANGELOG.md
@@ -1,5 +1,49 @@
 ChangeLog
 =========
+5.0.3 (2018-05-03)
+------------------
+
+* Dropped remaining hhvm leftovers.
+* #55: Fixed typo in WildcardEmitterTrait (@SamMousa)
+* #54: export-ignore examples & tests in distribution (@staabm)
+
+5.0.2 (2017-04-29)
+------------------
+
+* #50: Fixed Promise\all to resolve immediately for empty arrays (@MadHed)
+* #48, #49: Performance optimisations for EmitterTrait and WildcardEmitterTrait (@lunixyacht).
+
+5.0.1 (2016-10-29)
+------------------
+
+* #45: Fixed `Emitter` class to use the correct interface. (@felixfbecker).
+
+
+5.0.0 (2016-10-23)
+------------------
+
+* #42: The `coroutine` function now supports `return` in the passed generator
+  function. This allows you to more generally return a value. This is a BC
+  break as this is a feature that was only made possible with PHP 7, and
+  before the coroutine function would only ever return the last thing that
+  was yielded. If you depended on that feature, replace your last `yield` with
+  a `return`.
+
+
+4.0.0 (2016-09-19)
+------------------
+
+* sabre/event now requires PHP 7. If you need PHP 5.5 support, just keep
+  using 3.0.0.
+* PHP 7 type hints are now used everywhere. We're also using strict_types.
+* Support for a new `WildcardEmitter` which allows you to listen for events
+  using the `*` wildcard.
+* Removed deprecated functions `Promise::error` and `Promise::all`. Instead,
+  use `Promise::otherwise` and `Promise\all()`.
+* `EventEmitter`, `EventEmitterTrait` and `EventEmitterInterface` are now just
+  called `Emitter`, `EmitterTrait`, and `EmitterInterface`.
+* When rejecting Promises, it's now _required_ to use an `Exception` or
+  `Throwable`. This makes the typical case simpler and reduces special cases.
 
 3.0.0 (2015-11-05)
 ------------------
diff --git a/vendor/sabre/event/LICENSE b/vendor/sabre/event/LICENSE
index 9a495cef0..962a49267 100644
--- a/vendor/sabre/event/LICENSE
+++ b/vendor/sabre/event/LICENSE
@@ -1,4 +1,4 @@
-Copyright (C) 2013-2015 fruux GmbH (https://fruux.com/)
+Copyright (C) 2013-2016 fruux GmbH (https://fruux.com/)
 
 All rights reserved.
 
diff --git a/vendor/sabre/event/README.md b/vendor/sabre/event/README.md
index 364906fd4..9e2bdd042 100644
--- a/vendor/sabre/event/README.md
+++ b/vendor/sabre/event/README.md
@@ -17,7 +17,7 @@ Installation
 
 Make sure you have [composer][3] installed, and then run:
 
-    composer require sabre/event "~3.0.0"
+    composer require sabre/event "^3.0"
 
 This package requires PHP 5.5. The 2.0 branch is still maintained as well, and
 supports PHP 5.4.
@@ -27,10 +27,11 @@ Build status
 
 | branch | status |
 | ------ | ------ |
-| master | [![Build Status](https://travis-ci.org/fruux/sabre-event.svg?branch=master)](https://travis-ci.org/fruux/sabre-event) |
-| 2.0    | [![Build Status](https://travis-ci.org/fruux/sabre-event.svg?branch=2.0)](https://travis-ci.org/fruux/sabre-event) |
-| 1.0    | [![Build Status](https://travis-ci.org/fruux/sabre-event.svg?branch=1.0)](https://travis-ci.org/fruux/sabre-event) |
-| php53  | [![Build Status](https://travis-ci.org/fruux/sabre-event.svg?branch=php53)](https://travis-ci.org/fruux/sabre-event) |
+| master | [![Build Status](https://travis-ci.org/sabre-io/event.svg?branch=master)](https://travis-ci.org/sabre-io/event) |
+| 3.0    | [![Build Status](https://travis-ci.org/sabre-io/event.svg?branch=2.0)](https://travis-ci.org/sabre-io/event) |
+| 2.0    | [![Build Status](https://travis-ci.org/sabre-io/event.svg?branch=2.0)](https://travis-ci.org/sabre-io/event) |
+| 1.0    | [![Build Status](https://travis-ci.org/sabre-io/event.svg?branch=1.0)](https://travis-ci.org/sabre-io/event) |
+| php53  | [![Build Status](https://travis-ci.org/sabre-io/event.svg?branch=php53)](https://travis-ci.org/sabre-io/event) |
 
 
 Questions?
diff --git a/vendor/sabre/event/_config.yml b/vendor/sabre/event/_config.yml
new file mode 100644
index 000000000..c4192631f
--- /dev/null
+++ b/vendor/sabre/event/_config.yml
@@ -0,0 +1 @@
+theme: jekyll-theme-cayman
\ No newline at end of file
diff --git a/vendor/sabre/event/composer.json b/vendor/sabre/event/composer.json
index 9a11b01aa..d7a13c5ca 100644
--- a/vendor/sabre/event/composer.json
+++ b/vendor/sabre/event/composer.json
@@ -8,12 +8,15 @@
         "Hooks",
         "Plugin",
         "Signal",
-        "Async"
+        "Async",
+        "EventLoop",
+        "Reactor",
+        "Coroutine"
     ],
     "homepage": "http://sabre.io/event/",
     "license": "BSD-3-Clause",
     "require": {
-        "php": ">=5.5"
+        "php": ">=7.0"
     },
     "authors": [
         {
@@ -38,8 +41,8 @@
         ]
     },
     "require-dev": {
-        "sabre/cs": "~0.0.4",
-        "phpunit/phpunit" : "*"
+        "sabre/cs": "~1.0.0",
+        "phpunit/phpunit" : ">=6"
     },
     "config" : {
         "bin-dir" : "bin/"
diff --git a/vendor/sabre/event/lib/Emitter.php b/vendor/sabre/event/lib/Emitter.php
new file mode 100644
index 000000000..ab5e8c90e
--- /dev/null
+++ b/vendor/sabre/event/lib/Emitter.php
@@ -0,0 +1,18 @@
+<?php declare (strict_types=1);
+
+namespace Sabre\Event;
+
+/**
+ * Emitter object.
+ *
+ * Instantiate this class, or subclass it for easily creating event emitters.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Emitter implements EmitterInterface {
+
+    use EmitterTrait;
+
+}
diff --git a/vendor/sabre/event/lib/EventEmitterInterface.php b/vendor/sabre/event/lib/EmitterInterface.php
index 0e2be2cef..a7e4b6132 100644
--- a/vendor/sabre/event/lib/EventEmitterInterface.php
+++ b/vendor/sabre/event/lib/EmitterInterface.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare (strict_types=1);
 
 namespace Sabre\Event;
 
@@ -8,31 +8,25 @@ namespace Sabre\Event;
  * Anything that accepts listeners and emits events should implement this
  * interface.
  *
- * @copyright Copyright (C) 2013-2015 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface EventEmitterInterface {
+interface EmitterInterface {
 
     /**
      * Subscribe to an event.
      *
-     * @param string $eventName
-     * @param callable $callBack
-     * @param int $priority
      * @return void
      */
-    function on($eventName, callable $callBack, $priority = 100);
+    function on(string $eventName, callable $callBack, int $priority = 100);
 
     /**
      * Subscribe to an event exactly once.
      *
-     * @param string $eventName
-     * @param callable $callBack
-     * @param int $priority
      * @return void
      */
-    function once($eventName, callable $callBack, $priority = 100);
+    function once(string $eventName, callable $callBack, int $priority = 100);
 
     /**
      * Emits an event.
@@ -54,13 +48,8 @@ interface EventEmitterInterface {
      *
      * Lastly, if there are 5 event handlers for an event. The continueCallback
      * will be called at most 4 times.
-     *
-     * @param string $eventName
-     * @param array $arguments
-     * @param callback $continueCallBack
-     * @return bool
      */
-    function emit($eventName, array $arguments = [], callable $continueCallBack = null);
+    function emit(string $eventName, array $arguments = [], callable $continueCallBack = null) : bool;
 
     /**
      * Returns the list of listeners for an event.
@@ -68,22 +57,17 @@ interface EventEmitterInterface {
      * The list is returned as an array, and the list of events are sorted by
      * their priority.
      *
-     * @param string $eventName
      * @return callable[]
      */
-    function listeners($eventName);
+    function listeners(string $eventName) : array;
 
     /**
      * Removes a specific listener from an event.
      *
      * If the listener could not be found, this method will return false. If it
      * was removed it will return true.
-     *
-     * @param string $eventName
-     * @param callable $listener
-     * @return bool
      */
-    function removeListener($eventName, callable $listener);
+    function removeListener(string $eventName, callable $listener) : bool;
 
     /**
      * Removes all listeners.
@@ -92,9 +76,8 @@ interface EventEmitterInterface {
      * removed. If it is not specified, every listener for every event is
      * removed.
      *
-     * @param string $eventName
      * @return void
      */
-    function removeAllListeners($eventName = null);
+    function removeAllListeners(string $eventName = null);
 
 }
diff --git a/vendor/sabre/event/lib/EventEmitterTrait.php b/vendor/sabre/event/lib/EmitterTrait.php
index 257629fae..dafae362f 100644
--- a/vendor/sabre/event/lib/EventEmitterTrait.php
+++ b/vendor/sabre/event/lib/EmitterTrait.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare (strict_types=1);
 
 namespace Sabre\Event;
 
@@ -11,28 +11,19 @@ namespace Sabre\Event;
  * Using the trait + interface allows you to add EventEmitter capabilities
  * without having to change your base-class.
  *
- * @copyright Copyright (C) 2013-2015 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-trait EventEmitterTrait {
+trait EmitterTrait {
 
-    /**
-     * The list of listeners
-     *
-     * @var array
-     */
-    protected $listeners = [];
 
     /**
      * Subscribe to an event.
      *
-     * @param string $eventName
-     * @param callable $callBack
-     * @param int $priority
      * @return void
      */
-    function on($eventName, callable $callBack, $priority = 100) {
+    function on(string $eventName, callable $callBack, int $priority = 100) {
 
         if (!isset($this->listeners[$eventName])) {
             $this->listeners[$eventName] = [
@@ -51,18 +42,15 @@ trait EventEmitterTrait {
     /**
      * Subscribe to an event exactly once.
      *
-     * @param string $eventName
-     * @param callable $callBack
-     * @param int $priority
      * @return void
      */
-    function once($eventName, callable $callBack, $priority = 100) {
+    function once(string $eventName, callable $callBack, int $priority = 100) {
 
         $wrapper = null;
         $wrapper = function() use ($eventName, $callBack, &$wrapper) {
 
             $this->removeListener($eventName, $wrapper);
-            return call_user_func_array($callBack, func_get_args());
+            return \call_user_func_array($callBack, \func_get_args());
 
         };
 
@@ -90,19 +78,14 @@ trait EventEmitterTrait {
      *
      * Lastly, if there are 5 event handlers for an event. The continueCallback
      * will be called at most 4 times.
-     *
-     * @param string $eventName
-     * @param array $arguments
-     * @param callback $continueCallBack
-     * @return bool
      */
-    function emit($eventName, array $arguments = [], callable $continueCallBack = null) {
+    function emit(string $eventName, array $arguments = [], callable $continueCallBack = null) : bool {
 
-        if (is_null($continueCallBack)) {
+        if (\is_null($continueCallBack)) {
 
             foreach ($this->listeners($eventName) as $listener) {
 
-                $result = call_user_func_array($listener, $arguments);
+                $result = \call_user_func_array($listener, $arguments);
                 if ($result === false) {
                     return false;
                 }
@@ -111,12 +94,12 @@ trait EventEmitterTrait {
         } else {
 
             $listeners = $this->listeners($eventName);
-            $counter = count($listeners);
+            $counter = \count($listeners);
 
             foreach ($listeners as $listener) {
 
                 $counter--;
-                $result = call_user_func_array($listener, $arguments);
+                $result = \call_user_func_array($listener, $arguments);
                 if ($result === false) {
                     return false;
                 }
@@ -139,10 +122,9 @@ trait EventEmitterTrait {
      * The list is returned as an array, and the list of events are sorted by
      * their priority.
      *
-     * @param string $eventName
      * @return callable[]
      */
-    function listeners($eventName) {
+    function listeners(string $eventName) : array {
 
         if (!isset($this->listeners[$eventName])) {
             return [];
@@ -152,7 +134,7 @@ trait EventEmitterTrait {
         if (!$this->listeners[$eventName][0]) {
 
             // Sorting
-            array_multisort($this->listeners[$eventName][1], SORT_NUMERIC, $this->listeners[$eventName][2]);
+            \array_multisort($this->listeners[$eventName][1], SORT_NUMERIC, $this->listeners[$eventName][2]);
 
             // Marking the listeners as sorted
             $this->listeners[$eventName][0] = true;
@@ -167,12 +149,8 @@ trait EventEmitterTrait {
      *
      * If the listener could not be found, this method will return false. If it
      * was removed it will return true.
-     *
-     * @param string $eventName
-     * @param callable $listener
-     * @return bool
      */
-    function removeListener($eventName, callable $listener) {
+    function removeListener(string $eventName, callable $listener) : bool {
 
         if (!isset($this->listeners[$eventName])) {
             return false;
@@ -195,12 +173,11 @@ trait EventEmitterTrait {
      * removed. If it is not specified, every listener for every event is
      * removed.
      *
-     * @param string $eventName
      * @return void
      */
-    function removeAllListeners($eventName = null) {
+    function removeAllListeners(string $eventName = null) {
 
-        if (!is_null($eventName)) {
+        if (!\is_null($eventName)) {
             unset($this->listeners[$eventName]);
         } else {
             $this->listeners = [];
@@ -208,4 +185,11 @@ trait EventEmitterTrait {
 
     }
 
+    /**
+     * The list of listeners
+     *
+     * @var array
+     */
+    protected $listeners = [];
+
 }
diff --git a/vendor/sabre/event/lib/EventEmitter.php b/vendor/sabre/event/lib/EventEmitter.php
index 1bb1c3cf9..cae6ac2a6 100644
--- a/vendor/sabre/event/lib/EventEmitter.php
+++ b/vendor/sabre/event/lib/EventEmitter.php
@@ -1,18 +1,19 @@
-<?php
+<?php declare (strict_types=1);
 
 namespace Sabre\Event;
 
 /**
- * EventEmitter object.
+ * This is the old name for the Emitter class.
  *
- * Instantiate this class, or subclass it for easily creating event emitters.
+ * Instead of of using EventEmitter, please use Emitter. They are identical
+ * otherwise.
  *
- * @copyright Copyright (C) 2013-2015 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class EventEmitter implements EventEmitterInterface {
+class EventEmitter implements EmitterInterface {
 
-    use EventEmitterTrait;
+    use EmitterTrait;
 
 }
diff --git a/vendor/sabre/event/lib/Loop/Loop.php b/vendor/sabre/event/lib/Loop/Loop.php
index 86ee7c8b0..301fe8920 100644
--- a/vendor/sabre/event/lib/Loop/Loop.php
+++ b/vendor/sabre/event/lib/Loop/Loop.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare (strict_types=1);
 
 namespace Sabre\Event\Loop;
 
@@ -11,7 +11,7 @@ namespace Sabre\Event\Loop;
  *   * setInterval for repeating functions
  *   * stream events using stream_select
  *
- * @copyright Copyright (C) 2007-2015 fruux GmbH. (https://fruux.com/)
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -20,11 +20,9 @@ class Loop {
     /**
      * Executes a function after x seconds.
      *
-     * @param callable $cb
-     * @param float $timeout timeout in seconds
      * @return void
      */
-    function setTimeout(callable $cb, $timeout) {
+    function setTimeout(callable $cb, float $timeout) {
 
         $triggerTime = microtime(true) + ($timeout);
 
@@ -63,12 +61,8 @@ class Loop {
      *
      * The value this function returns can be used to stop the interval with
      * clearInterval.
-     *
-     * @param callable $cb
-     * @param float $timeout
-     * @return array
      */
-    function setInterval(callable $cb, $timeout) {
+    function setInterval(callable $cb, float $timeout) : array {
 
         $keepGoing = true;
         $f = null;
@@ -92,12 +86,11 @@ class Loop {
     }
 
     /**
-     * Stops a running internval.
+     * Stops a running interval.
      *
-     * @param array $intervalId
      * @return void
      */
-    function clearInterval($intervalId) {
+    function clearInterval(array $intervalId) {
 
         $intervalId[1] = false;
 
@@ -106,7 +99,6 @@ class Loop {
     /**
      * Runs a function immediately at the next iteration of the loop.
      *
-     * @param callable $cb
      * @return void
      */
     function nextTick(callable $cb) {
@@ -126,7 +118,6 @@ class Loop {
      * prevent the eventloop from never stopping.
      *
      * @param resource $stream
-     * @param callable $cb
      * @return void
      */
     function addReadStream($stream, callable $cb) {
@@ -146,7 +137,6 @@ class Loop {
      * prevent the eventloop from never stopping.
      *
      * @param resource $stream
-     * @param callable $cb
      * @return void
      */
     function addWriteStream($stream, callable $cb) {
@@ -219,11 +209,8 @@ class Loop {
      *
      * This function will return true if there are _any_ events left in the
      * loop after the tick.
-     *
-     * @param bool $block
-     * @return bool
      */
-    function tick($block = false) {
+    function tick(bool $block = false) : bool {
 
         $this->runNextTicks();
         $nextTimeout = $this->runTimers();
@@ -284,7 +271,7 @@ class Loop {
      *
      * If there's no more pending timers, this function returns null.
      *
-     * @return float
+     * @return float|null
      */
     protected function runTimers() {
 
@@ -295,7 +282,7 @@ class Loop {
         // Add the last timer back to the array.
         if ($timer) {
             $this->timers[] = $timer;
-            return $timer[0] - microtime(true);
+            return max(0, $timer[0] - microtime(true));
         }
 
     }
@@ -303,7 +290,10 @@ class Loop {
     /**
      * Runs all pending stream events.
      *
-     * @param float $timeout
+     * If $timeout is 0, it will return immediately. If $timeout is null, it
+     * will wait indefinitely.
+     *
+     * @param float|null timeout
      */
     protected function runStreams($timeout) {
 
@@ -312,7 +302,7 @@ class Loop {
             $read = $this->readStreams;
             $write = $this->writeStreams;
             $except = null;
-            if (stream_select($read, $write, $except, null, $timeout)) {
+            if (stream_select($read, $write, $except, ($timeout === null) ? null : 0, $timeout ? (int)($timeout * 1000000) : 0)) {
 
                 // See PHP Bug https://bugs.php.net/bug.php?id=62452
                 // Fixed in PHP7
@@ -328,7 +318,7 @@ class Loop {
             }
 
         } elseif ($this->running && ($this->nextTick || $this->timers)) {
-            usleep($timeout !== null ? $timeout * 1000000 : 200000);
+            usleep($timeout !== null ? intval($timeout * 1000000) : 200000);
         }
 
     }
diff --git a/vendor/sabre/event/lib/Loop/functions.php b/vendor/sabre/event/lib/Loop/functions.php
index 56c5bc8c7..b5884b2b6 100644
--- a/vendor/sabre/event/lib/Loop/functions.php
+++ b/vendor/sabre/event/lib/Loop/functions.php
@@ -1,15 +1,13 @@
-<?php
+<?php declare (strict_types=1);
 
 namespace Sabre\Event\Loop;
 
 /**
  * Executes a function after x seconds.
  *
- * @param callable $cb
- * @param float $timeout timeout in seconds
  * @return void
  */
-function setTimeout(callable $cb, $timeout) {
+function setTimeout(callable $cb, float $timeout) {
 
     instance()->setTimeout($cb, $timeout);
 
@@ -20,24 +18,19 @@ function setTimeout(callable $cb, $timeout) {
  *
  * The value this function returns can be used to stop the interval with
  * clearInterval.
- *
- * @param callable $cb
- * @param float $timeout
- * @return array
  */
-function setInterval(callable $cb, $timeout) {
+function setInterval(callable $cb, float $timeout) : array {
 
     return instance()->setInterval($cb, $timeout);
 
 }
 
 /**
- * Stops a running internval.
+ * Stops a running interval.
  *
- * @param array $intervalId
  * @return void
  */
-function clearInterval($intervalId) {
+function clearInterval(array $intervalId) {
 
     instance()->clearInterval($intervalId);
 
@@ -46,7 +39,6 @@ function clearInterval($intervalId) {
 /**
  * Runs a function immediately at the next iteration of the loop.
  *
- * @param callable $cb
  * @return void
  */
 function nextTick(callable $cb) {
@@ -66,7 +58,6 @@ function nextTick(callable $cb) {
  * prevent the eventloop from never stopping.
  *
  * @param resource $stream
- * @param callable $cb
  * @return void
  */
 function addReadStream($stream, callable $cb) {
@@ -85,7 +76,6 @@ function addReadStream($stream, callable $cb) {
  * prevent the eventloop from never stopping.
  *
  * @param resource $stream
- * @param callable $cb
  * @return void
  */
 function addWriteStream($stream, callable $cb) {
@@ -144,11 +134,8 @@ function run() {
  *
  * This function will return true if there are _any_ events left in the
  * loop after the tick.
- *
- * @param bool $block
- * @return bool
  */
-function tick($block = false) {
+function tick(bool $block = false) : bool {
 
     return instance()->tick($block);
 
@@ -167,10 +154,8 @@ function stop() {
 
 /**
  * Retrieves or sets the global Loop object.
- *
- * @param Loop $newLoop
  */
-function instance(Loop $newLoop = null) {
+function instance(Loop $newLoop = null) : Loop {
 
     static $loop;
     if ($newLoop) {
diff --git a/vendor/sabre/event/lib/Promise.php b/vendor/sabre/event/lib/Promise.php
index 1c874c1bd..1d04bd4d4 100644
--- a/vendor/sabre/event/lib/Promise.php
+++ b/vendor/sabre/event/lib/Promise.php
@@ -1,8 +1,9 @@
-<?php
+<?php declare (strict_types=1);
 
 namespace Sabre\Event;
 
 use Exception;
+use Throwable;
 
 /**
  * An implementation of the Promise pattern.
@@ -16,7 +17,7 @@ use Exception;
  *
  * To get a callback when the operation has finished, use the `then` method.
  *
- * @copyright Copyright (C) 2013-2015 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -52,8 +53,6 @@ class Promise {
      *
      * Each are callbacks that map to $this->fulfill and $this->reject.
      * Using the executor is optional.
-     *
-     * @param callable $executor
      */
     function __construct(callable $executor = null) {
 
@@ -84,12 +83,8 @@ class Promise {
      *
      * If either of the callbacks throw an exception, the returned promise will
      * be rejected and the exception will be passed back.
-     *
-     * @param callable $onFulfilled
-     * @param callable $onRejected
-     * @return Promise
      */
-    function then(callable $onFulfilled = null, callable $onRejected = null) {
+    function then(callable $onFulfilled = null, callable $onRejected = null) : Promise {
 
         // This new subPromise will be returned from this function, and will
         // be fulfilled with the result of the onFulfilled or onRejected event
@@ -122,11 +117,8 @@ class Promise {
      *
      * Its usage is identical to then(). However, the otherwise() function is
      * preferred.
-     *
-     * @param callable $onRejected
-     * @return Promise
      */
-    function otherwise(callable $onRejected) {
+    function otherwise(callable $onRejected) : Promise {
 
         return $this->then(null, $onRejected);
 
@@ -152,13 +144,9 @@ class Promise {
     /**
      * Marks this promise as rejected, and set it's rejection reason.
      *
-     * While it's possible to use any PHP value as the reason, it's highly
-     * recommended to use an Exception for this.
-     *
-     * @param mixed $reason
      * @return void
      */
-    function reject($reason = null) {
+    function reject(Throwable $reason) {
         if ($this->state !== self::PENDING) {
             throw new PromiseAlreadyResolvedException('This promise is already resolved, and you\'re not allowed to resolve a promise more than once');
         }
@@ -181,7 +169,6 @@ class Promise {
      * one. In PHP it might be useful to call this on the last promise in a
      * chain.
      *
-     * @throws Exception
      * @return mixed
      */
     function wait() {
@@ -205,15 +192,7 @@ class Promise {
         } else {
             // If we got here, it means that the asynchronous operation
             // errored. Therefore we need to throw an exception.
-            $reason = $this->value;
-            if ($reason instanceof Exception) {
-                throw $reason;
-            } elseif (is_scalar($reason)) {
-                throw new Exception($reason);
-            } else {
-                $type = is_object($reason) ? get_class($reason) : gettype($reason);
-                throw new Exception('Promise was rejected with reason of type: ' . $type);
-            }
+            throw $this->value;
         }
 
 
@@ -272,7 +251,7 @@ class Promise {
                         // immediately fulfill the chained promise.
                         $subPromise->fulfill($result);
                     }
-                } catch (Exception $e) {
+                } catch (Throwable $e) {
                     // If the event handler threw an exception, we need to make sure that
                     // the chained promise is rejected as well.
                     $subPromise->reject($e);
@@ -287,34 +266,4 @@ class Promise {
         });
     }
 
-    /**
-     * Alias for 'otherwise'.
-     *
-     * This function is now deprecated and will be removed in a future version.
-     *
-     * @param callable $onRejected
-     * @deprecated
-     * @return Promise
-     */
-    function error(callable $onRejected) {
-
-        return $this->otherwise($onRejected);
-
-    }
-
-    /**
-     * Deprecated.
-     *
-     * Please use Sabre\Event\Promise::all
-     *
-     * @param Promise[] $promises
-     * @deprecated
-     * @return Promise
-     */
-    static function all(array $promises) {
-
-        return Promise\all($promises);
-
-    }
-
 }
diff --git a/vendor/sabre/event/lib/Promise/functions.php b/vendor/sabre/event/lib/Promise/functions.php
index 3604b8aaa..275492cbc 100644
--- a/vendor/sabre/event/lib/Promise/functions.php
+++ b/vendor/sabre/event/lib/Promise/functions.php
@@ -1,14 +1,15 @@
-<?php
+<?php declare (strict_types=1);
 
 namespace Sabre\Event\Promise;
 
 use Sabre\Event\Promise;
+use Throwable;
 
 /**
  * This file contains a set of functions that are useful for dealing with the
  * Promise object.
  *
- * @copyright Copyright (C) 2013-2015 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -27,12 +28,16 @@ use Sabre\Event\Promise;
  * fail with the first Promise that fails, and its reason.
  *
  * @param Promise[] $promises
- * @return Promise
  */
-function all(array $promises) {
+function all(array $promises) : Promise {
 
     return new Promise(function($success, $fail) use ($promises) {
 
+        if (empty($promises)) {
+            $success([]);
+            return;
+        }
+
         $successCount = 0;
         $completeResult = [];
 
@@ -47,7 +52,7 @@ function all(array $promises) {
                     }
                     return $result;
                 }
-            )->error(
+            )->otherwise(
                 function($reason) use ($fail) {
                     $fail($reason);
                 }
@@ -66,9 +71,8 @@ function all(array $promises) {
  * that first promise.
  *
  * @param Promise[] $promises
- * @return Promise
  */
-function race(array $promises) {
+function race(array $promises) : Promise {
 
     return new Promise(function($success, $fail) use ($promises) {
 
@@ -106,9 +110,8 @@ function race(array $promises) {
  * promise and eventually get the same state as the followed promise.
  *
  * @param mixed $value
- * @return Promise
  */
-function resolve($value) {
+function resolve($value) : Promise {
 
     if ($value instanceof Promise) {
         return $value->then();
@@ -122,11 +125,8 @@ function resolve($value) {
 
 /**
  * Returns a Promise that will reject with the given reason.
- *
- * @param mixed $reason
- * @return Promise
  */
-function reject($reason) {
+function reject(Throwable $reason) : Promise {
 
     $promise = new Promise();
     $promise->reject($reason);
diff --git a/vendor/sabre/event/lib/PromiseAlreadyResolvedException.php b/vendor/sabre/event/lib/PromiseAlreadyResolvedException.php
index 86a6c5b3f..534a3d494 100644
--- a/vendor/sabre/event/lib/PromiseAlreadyResolvedException.php
+++ b/vendor/sabre/event/lib/PromiseAlreadyResolvedException.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare (strict_types=1);
 
 namespace Sabre\Event;
 
@@ -6,7 +6,7 @@ namespace Sabre\Event;
  * This exception is thrown when the user tried to reject or fulfill a promise,
  * after either of these actions were already performed.
  *
- * @copyright Copyright (C) 2013-2015 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
diff --git a/vendor/sabre/event/lib/Version.php b/vendor/sabre/event/lib/Version.php
index 5de22193f..9aee4b3ab 100644
--- a/vendor/sabre/event/lib/Version.php
+++ b/vendor/sabre/event/lib/Version.php
@@ -1,11 +1,11 @@
-<?php
+<?php declare (strict_types=1);
 
 namespace Sabre\Event;
 
 /**
  * This class contains the version number for this package.
  *
- * @copyright Copyright (C) 2013-2015 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -14,6 +14,6 @@ class Version {
     /**
      * Full version number
      */
-    const VERSION = '3.0.0';
+    const VERSION = '5.0.3';
 
 }
diff --git a/vendor/sabre/event/lib/WildcardEmitter.php b/vendor/sabre/event/lib/WildcardEmitter.php
new file mode 100644
index 000000000..2ef15fe83
--- /dev/null
+++ b/vendor/sabre/event/lib/WildcardEmitter.php
@@ -0,0 +1,37 @@
+<?php declare (strict_types=1);
+
+namespace Sabre\Event;
+
+/**
+ * This class is an EventEmitter with support for wildcard event handlers.
+ *
+ * What this means is that you can emit events like this:
+ *
+ *   emit('change:firstName')
+ *
+ * and listen to this event like this:
+ *
+ *   on('change:*')
+ *
+ * A few notes:
+ * 
+ * - Wildcards only work at the end of an event name.
+ * - Currently you can only use 1 wildcard.
+ * - Using ":" as a separator is optional, but it's highly recommended to use
+ *   some kind of separator.
+ *
+ * The WilcardEmitter is a bit slower than the regular Emitter. If you code
+ * must be very high performance, it might be better to try to use the other
+ * emitter. For must usage the difference is negligible though.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class WildcardEmitter implements EmitterInterface {
+
+    use WildcardEmitterTrait;
+
+
+
+}
diff --git a/vendor/sabre/event/lib/WildcardEmitterTrait.php b/vendor/sabre/event/lib/WildcardEmitterTrait.php
new file mode 100644
index 000000000..7d8d62c26
--- /dev/null
+++ b/vendor/sabre/event/lib/WildcardEmitterTrait.php
@@ -0,0 +1,264 @@
+<?php declare (strict_types=1);
+
+namespace Sabre\Event;
+
+/**
+ * Wildcard Emitter Trait
+ *
+ * This trait provides the implementation for WildCardEmitter
+ * Refer to that class for the full documentation about this
+ * trait.
+ *
+ * Normally you can just instantiate that class, but if you want to add
+ * emitter functionality to existing classes, using the trait might be a
+ * better way to do this.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+trait WildcardEmitterTrait {
+
+    /**
+     * Subscribe to an event.
+     *
+     * @return void
+     */
+    function on(string $eventName, callable $callBack, int $priority = 100) {
+
+        // If it ends with a wildcard, we use the wildcardListeners array 
+        if ($eventName[\strlen($eventName) - 1] === '*') {
+            $eventName = \substr($eventName, 0, -1);
+            $listeners = & $this->wildcardListeners;
+        } else {
+            $listeners = & $this->listeners;
+        }
+
+        // Always fully reset the listener index. This is fairly sane for most
+        // applications, because there's a clear "event registering" and "event
+        // emitting" phase, but can be slow if there's a lot adding and removing
+        // of listeners during emitting of events.
+        $this->listenerIndex = [];
+
+        if (!isset($listeners[$eventName])) {
+            $listeners[$eventName] = [];
+        }
+        $listeners[$eventName][] = [$priority, $callBack];
+
+    }
+
+    /**
+     * Subscribe to an event exactly once.
+     *
+     * @return void
+     */
+    function once(string $eventName, callable $callBack, int $priority = 100) {
+
+        $wrapper = null;
+        $wrapper = function() use ($eventName, $callBack, &$wrapper) {
+
+            $this->removeListener($eventName, $wrapper);
+            return \call_user_func_array($callBack, \func_get_args());
+
+        };
+
+        $this->on($eventName, $wrapper, $priority);
+
+    }
+
+    /**
+     * Emits an event.
+     *
+     * This method will return true if 0 or more listeners were succesfully
+     * handled. false is returned if one of the events broke the event chain.
+     *
+     * If the continueCallBack is specified, this callback will be called every
+     * time before the next event handler is called.
+     *
+     * If the continueCallback returns false, event propagation stops. This
+     * allows you to use the eventEmitter as a means for listeners to implement
+     * functionality in your application, and break the event loop as soon as
+     * some condition is fulfilled.
+     *
+     * Note that returning false from an event subscriber breaks propagation
+     * and returns false, but if the continue-callback stops propagation, this
+     * is still considered a 'successful' operation and returns true.
+     *
+     * Lastly, if there are 5 event handlers for an event. The continueCallback
+     * will be called at most 4 times.
+     */
+    function emit(string $eventName, array $arguments = [], callable $continueCallBack = null) : bool {
+
+        if (\is_null($continueCallBack)) {
+
+            foreach ($this->listeners($eventName) as $listener) {
+
+                $result = \call_user_func_array($listener, $arguments);
+                if ($result === false) {
+                    return false;
+                }
+            }
+
+        } else {
+
+            $listeners = $this->listeners($eventName);
+            $counter = \count($listeners);
+
+            foreach ($listeners as $listener) {
+
+                $counter--;
+                $result = \call_user_func_array($listener, $arguments);
+                if ($result === false) {
+                    return false;
+                }
+
+                if ($counter > 0) {
+                    if (!$continueCallBack()) break;
+                }
+
+            }
+
+        }
+
+        return true;
+
+
+    }
+
+    /**
+     * Returns the list of listeners for an event.
+     *
+     * The list is returned as an array, and the list of events are sorted by
+     * their priority.
+     *
+     * @return callable[]
+     */
+    function listeners(string $eventName) : array {
+
+        if (!\array_key_exists($eventName, $this->listenerIndex)) {
+
+            // Create a new index.
+            $listeners = [];
+            $listenersPriority = [];
+            if (isset($this->listeners[$eventName])) foreach ($this->listeners[$eventName] as $listener) {
+
+                $listenersPriority[] = $listener[0];
+                $listeners[] = $listener[1];
+
+            }
+
+            foreach ($this->wildcardListeners as $wcEvent => $wcListeners) {
+
+                // Wildcard match
+                if (\substr($eventName, 0, \strlen($wcEvent)) === $wcEvent) {
+
+                    foreach ($wcListeners as $listener) {
+
+                        $listenersPriority[] = $listener[0];
+                        $listeners[] = $listener[1];
+
+                    }
+
+                }
+
+            }
+
+            // Sorting by priority
+            \array_multisort($listenersPriority, SORT_NUMERIC, $listeners);
+
+            // Creating index
+            $this->listenerIndex[$eventName] = $listeners;
+
+        }
+
+        return $this->listenerIndex[$eventName];
+
+    }
+
+    /**
+     * Removes a specific listener from an event.
+     *
+     * If the listener could not be found, this method will return false. If it
+     * was removed it will return true.
+     */
+    function removeListener(string $eventName, callable $listener) : bool {
+
+        // If it ends with a wildcard, we use the wildcardListeners array 
+        if ($eventName[\strlen($eventName) - 1] === '*') {
+            $eventName = \substr($eventName, 0, -1);
+            $listeners = & $this->wildcardListeners;
+        } else {
+            $listeners = & $this->listeners;
+        }
+
+        if (!isset($listeners[$eventName])) {
+            return false;
+        }
+
+        foreach ($listeners[$eventName] as $index => $check) {
+
+            if ($check[1] === $listener) {
+
+                // Remove listener
+                unset($listeners[$eventName][$index]);
+                // Reset index
+                $this->listenerIndex = [];
+                return true;
+
+            }
+
+        }
+
+        return false;
+
+    }
+
+    /**
+     * Removes all listeners.
+     *
+     * If the eventName argument is specified, all listeners for that event are
+     * removed. If it is not specified, every listener for every event is
+     * removed.
+     *
+     * @return void
+     */
+    function removeAllListeners(string $eventName = null) {
+
+        if (\is_null($eventName)) {
+            $this->listeners = [];
+            $this->wildcardListeners = [];
+
+        } else {
+
+            if ($eventName[\strlen($eventName) - 1] === '*') {
+                // Wildcard event
+                unset($this->wildcardListeners[\substr($eventName, 0, -1)]);
+            } else {
+                unset($this->listeners[$eventName]);
+            }
+
+        }
+
+        // Reset index
+        $this->listenerIndex = [];
+
+    }
+
+    /**
+     * The list of listeners
+     */
+    protected $listeners = [];
+
+    /**
+     * The list of "wildcard listeners". 
+     */
+    protected $wildcardListeners = [];
+
+    /**
+     * An index of listeners for a specific event name. This helps speeding
+     * up emitting events after all listeners have been set.
+     *
+     * If the list of listeners changes though, the index clears.
+     */
+    protected $listenerIndex = [];
+}
diff --git a/vendor/sabre/event/lib/coroutine.php b/vendor/sabre/event/lib/coroutine.php
index 19c0ba8a7..750e8ab52 100644
--- a/vendor/sabre/event/lib/coroutine.php
+++ b/vendor/sabre/event/lib/coroutine.php
@@ -1,9 +1,9 @@
-<?php
+<?php declare (strict_types=1);
 
 namespace Sabre\Event;
 
 use Generator;
-use Exception;
+use Throwable;
 
 /**
  * Turn asynchronous promise-based code into something that looks synchronous
@@ -34,17 +34,18 @@ use Exception;
  *     yield $httpClient->request('GET', '/foo');
  *     yield $httpClient->request('DELETE', /foo');
  *     yield $httpClient->request('PUT', '/foo');
- *   } catch(\Exception $reason) {
+ *   } catch(\Throwable $reason) {
  *     echo "Failed because: $reason\n";
  *   }
  *
  * });
  *
- * @copyright Copyright (C) 2013-2015 fruux GmbH. All rights reserved.
+ * @return \Sabre\Event\Promise
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-function coroutine(callable $gen) {
+function coroutine(callable $gen) : Promise {
 
     $generator = $gen();
     if (!$generator instanceof Generator) {
@@ -54,8 +55,6 @@ function coroutine(callable $gen) {
     // This is the value we're returning.
     $promise = new Promise();
 
-    $lastYieldResult = null;
-
     /**
      * So tempted to use the mythical y-combinator here, but it's not needed in
      * PHP.
@@ -68,22 +67,14 @@ function coroutine(callable $gen) {
             if ($yieldedValue instanceof Promise) {
                 $yieldedValue->then(
                     function($value) use ($generator, &$advanceGenerator, &$lastYieldResult) {
-                        $lastYieldResult = $value;
                         $generator->send($value);
                         $advanceGenerator();
                     },
-                    function($reason) use ($generator, $advanceGenerator) {
-                        if ($reason instanceof Exception) {
-                            $generator->throw($reason);
-                        } elseif (is_scalar($reason)) {
-                            $generator->throw(new Exception($reason));
-                        } else {
-                            $type = is_object($reason) ? get_class($reason) : gettype($reason);
-                            $generator->throw(new Exception('Promise was rejected with reason of type: ' . $type));
-                        }
+                    function(Throwable $reason) use ($generator, $advanceGenerator) {
+                        $generator->throw($reason);
                         $advanceGenerator();
                     }
-                )->error(function($reason) use ($promise) {
+                )->otherwise(function(Throwable $reason) use ($promise) {
                     // This error handler would be called, if something in the
                     // generator throws an exception, and it's not caught
                     // locally.
@@ -94,24 +85,38 @@ function coroutine(callable $gen) {
                 break;
             } else {
                 // If the value was not a promise, we'll just let it pass through.
-                $lastYieldResult = $yieldedValue;
                 $generator->send($yieldedValue);
             }
 
         }
 
         // If the generator is at the end, and we didn't run into an exception,
-        // we can fullfill the promise with the last thing that was yielded to
-        // us.
-        if (!$generator->valid() && $promise->state === Promise::PENDING) {
-            $promise->fulfill($lastYieldResult);
+        // We're grabbing the "return" value and fulfilling our top-level
+        // promise with its value.
+         if (!$generator->valid() && $promise->state === Promise::PENDING) {
+             $returnValue = $generator->getReturn();
+
+             // The return value is a promise.
+             if ($returnValue instanceof Promise) {
+                 $returnValue->then(function($value) use ($promise) {
+                     $promise->fulfill($value);
+                 }, function(Throwable $reason) {
+                     $promise->reject($reason);
+                 });
+             } else {
+
+                 $promise->fulfill($returnValue);
+
+             }
+
+
         }
 
     };
 
     try {
         $advanceGenerator();
-    } catch (Exception $e) {
+    } catch (Throwable $e) {
         $promise->reject($e);
     }