initial sabre upgrade (needs lots of work - to wit: authentication, redo the browser interface, and rework event export/import)

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diff --git a/vendor/sabre/xml/CHANGELOG.md b/vendor/sabre/xml/CHANGELOG.md
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+ChangeLog
+=========
+
+1.4.1 (2016-03-12)
+-----------------
+
+* Parsing clark-notation is now cached. This can speed up parsing large
+  documents with lots of repeating elements a fair bit. (@icewind1991).
+
+
+1.4.0 (2016-02-14)
+------------------
+
+* Any array thrown into the serializer with numeric keys is now simply
+  traversed and each individual item is serialized. This fixes an issue
+  related to serializing value objects with array children.
+* When serializing value objects, properties that have a null value or an
+  empty array are now skipped. We believe this to be the saner default, but
+  does constitute a BC break for those depending on this.
+* Serializing array properties in value objects was broken.
+
+
+1.3.0 (2015-12-29)
+------------------
+
+* The `Service` class adds a new `mapValueObject` method which provides basic
+  capabilities to map between ValueObjects and XML.
+* #61: You can now specify serializers for specific classes, allowing you
+  separate the object you want to serialize from the serializer. This uses the
+  `$classMap` property which is defined on both the `Service` and `Writer`.
+* It's now possible to pass an array of possible root elements to
+  `Sabre\Xml\Service::expect()`.
+* Moved some parsing logic to `Reader::getDeserializerForElementName()`,
+  so people with more advanced use-cases can implement their own logic there.
+* #63: When serializing elements using arrays, the `value` key in the array is
+  now optional.
+* #62: Added a `keyValue` deserializer function. This can be used instead of
+  the `Element\KeyValue` class and is a lot more flexible. (@staabm)
+* Also added an `enum` deserializer function to replace
+  `Element\Elements`.
+* Using an empty string for a namespace prefix now has the same effect as
+  `null`.
+
+
+1.2.0 (2015-08-30)
+------------------
+
+* #53: Added `parseGetElements`, a function like `parseInnerTree`, except
+  that it always returns an array of elements, or an empty array.
+
+
+1.1.0 (2015-06-29)
+------------------
+
+* #44, #45: Catching broken and invalid XML better and throwing
+  `Sabre\Xml\LibXMLException` whenever we encounter errors. (@stefanmajoor,
+   @DaanBiesterbos)
+
+
+1.0.0 (2015-05-25)
+------------------
+
+* No functional changes since 0.4.3. Marking it as 1.0.0 as a promise for
+  API stability.
+* Using php-cs-fixer for automated CS enforcement.
+
+
+0.4.3 (2015-04-01)
+-----------------
+
+* Minor tweaks for the public release.
+
+
+0.4.2 (2015-03-20)
+------------------
+
+* Removed `constants.php` again. They messed with PHPUnit and don't really
+  provide a great benefit.
+* #41: Correctly handle self-closing xml elements.
+
+
+0.4.1 (2015-03-19)
+------------------
+
+* #40: An element with an empty namespace (xmlns="") is not allowed to have a
+  prefix. This is now fixed.
+
+
+0.4.0 (2015-03-18)
+------------------
+
+* Added `Sabre\Xml\Service`. This is intended as a simple way to centrally
+  configure xml applications and easily parse/write things from there. #35, #38.
+* Renamed 'baseUri' to 'contextUri' everywhere.
+* #36: Added a few convenience constants to `lib/constants.php`.
+* `Sabre\Xml\Util::parseClarkNotation` is now in the `Sabre\Xml\Service` class.
+
+
+0.3.1 (2015-02-08)
+------------------
+
+* Added `XmlDeserializable` to match `XmlSerializable`.
+
+
+0.3.0 (2015-02-06)
+------------------
+
+* Added `$elementMap` argument to parseInnerTree, for quickly overriding
+  parsing rules within an element.
+
+
+0.2.2 (2015-02-05)
+------------------
+
+* Now depends on sabre/uri 1.0.
+
+
+0.2.1 (2014-12-17)
+------------------
+
+* LibXMLException now inherits from ParseException, so it's easy for users to
+  catch any exception thrown by the parser.
+
+
+0.2.0 (2014-12-05)
+------------------
+
+* Major BC Break: method names for the Element interface have been renamed
+  from `serializeXml` and `deserializeXml` to `xmlSerialize` and
+  `xmlDeserialize`. This is so that it matches PHP's `JsonSerializable`
+  interface.
+* #25: Added `XmlSerializable` to allow people to write serializers without
+  having to implement a deserializer in the same class.
+* #26: Renamed the `Sabre\XML` namespace to `Sabre\Xml`. Due to composer magic
+  and the fact that PHP namespace are case-insensitive, this should not affect
+  anyone, unless you are doing exact string matches on class names.
+* #23: It's not possible to automatically extract or serialize Xml fragments
+  from documents using `Sabre\Xml\Element\XmlFragment`.
+
+
+0.1.0 (2014-11-24)
+------------------
+
+* #16: Added ability to override `elementMap`, `namespaceMap` and `baseUri` for
+  a fragment of a document during reading an writing using `pushContext` and
+  `popContext`.
+* Removed: `Writer::$context` and `Reader::$context`.
+* #15: Added `Reader::$baseUri` to match `Writer::$baseUri`.
+* #20: Allow callbacks to be used instead of `Element` classes in the `Reader`.
+* #25: Added `readText` to quickly grab all text from a node and advance the
+  reader to the next node.
+* #15: Added `Sabre\XML\Element\Uri`.
+
+
+0.0.6 (2014-09-26)
+------------------
+
+* Added: `CData` element.
+* #13: Better support for xml with no namespaces. (@kalmas)
+* Switched to PSR-4 directory structure.
+
+
+0.0.5 (2013-03-27)
+------------------
+
+* Added: baseUri property to the Writer class.
+* Added: The writeElement method can now write complex elements.
+* Added: Throwing exception when invalid objects are written.
+
+
+0.0.4 (2013-03-14)
+------------------
+
+* Fixed: The KeyValue parser was skipping over elements when there was no
+  whitespace between them.
+* Fixed: Clearing libxml errors after parsing.
+* Added: Support for CDATA.
+* Added: Context properties.
+
+
+0.0.3 (2013-02-22)
+------------------
+
+* Changed: Reader::parse returns an array with 1 level less depth.
+* Added: A LibXMLException is now thrown if the XMLReader comes across an error.
+* Fixed: Both the Elements and KeyValue parsers had severe issues with
+  nesting.
+* Fixed: The reader now detects when the end of the document is hit before it
+  should (because we're still parsing an element).
+
+
+0.0.2 (2013-02-17)
+------------------
+
+* Added: Elements parser.
+* Added: KeyValue parser.
+* Change: Reader::parseSubTree is now named parseInnerTree, and returns either
+  a string (in case of a text-node), or an array (in case there were child
+  elements).
+* Added: Reader::parseCurrentElement is now public.
+
+
+0.0.1 (2013-02-07)
+------------------
+
+* First alpha release
+
+Project started: 2012-11-13. First experiments in June 2009.