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

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+ChangeLog
+=========
+
+4.2.1 (2016-01-06)
+------------------
+
+* #56: `getBodyAsString` now returns at most as many bytes as the contents of
+  the `Content-Length` header. This allows users to pass much larger strings
+  without having to copy and truncate them.
+
+
+4.2.0 (2016-01-04)
+------------------
+
+* This package now supports sabre/event 3.0.
+* The client now sets a default `User-Agent` header identifying this library.
+
+
+4.1.0 (2015-09-04)
+------------------
+
+* The async client wouldn't `wait()` for new http requests being started
+  after the (previous) last request in the queue was resolved.
+* Added `Sabre\HTTP\Auth\Bearer`, to easily extract a OAuth2 bearer token.
+
+
+4.0.0 (2015-05-20)
+------------------
+
+* Deprecated: All static functions from `Sabre\HTTP\URLUtil` and
+  `Sabre\HTTP\Util` moved to a separate `functions.php`, which is also
+  autoloaded. The old functions are still there, but will be removed in a
+  future version. (#49)
+
+
+4.0.0-alpha3 (2015-05-19)
+-------------------------
+
+* Added a parser for the HTTP `Prefer` header, as defined in [RFC7240][rfc7240].
+* Deprecated `Sabre\HTTP\Util::parseHTTPDate`, use `Sabre\HTTP\parseDate()`.
+* Deprecated `Sabre\HTTP\Util::toHTTPDate` use `Sabre\HTTP\toDate()`.
+
+
+4.0.0-alpha2 (2015-05-18)
+-------------------------
+
+* #45: Don't send more data than what is promised in the HTTP content-length.
+  (@dratini0).
+* #43: `getCredentials` returns null if incomplete. (@Hywan)
+* #48: Now using php-cs-fixer to make our CS consistent (yay!)
+* This includes fixes released in version 3.0.5.
+
+
+4.0.0-alpha1 (2015-02-25)
+-------------------------
+
+* #41: Fixing bugs related to comparing URLs in `Request::getPath()`.
+* #41: This library now uses the `sabre/uri` package for uri handling.
+* Added `421 Misdirected Request` from the HTTP/2.0 spec.
+
+
+3.0.5 (2015-05-11)
+------------------
+
+* #47 #35: When re-using the client and doing any request after a `HEAD`
+  request, the client discards the body.
+
+
+3.0.4 (2014-12-10)
+------------------
+
+* #38: The Authentication helpers no longer overwrite any existing
+  `WWW-Authenticate` headers, but instead append new headers. This ensures
+  that multiple authentication systems can exist in the same environment.
+
+
+3.0.3 (2014-12-03)
+------------------
+
+* Hiding `Authorization` header value from `Request::__toString`.
+
+
+3.0.2 (2014-10-09)
+------------------
+
+* When parsing `Accept:` headers, we're ignoring invalid parts. Before we
+  would throw a PHP E_NOTICE.
+
+
+3.0.1 (2014-09-29)
+------------------
+
+* Minor change in unittests.
+
+
+3.0.0 (2014-09-23)
+------------------
+
+* `getHeaders()` now returns header values as an array, just like psr/http.
+* Added `hasHeader()`.
+
+
+2.1.0-alpha1 (2014-09-15)
+-------------------------
+
+* Changed: Copied most of the header-semantics for the PSR draft for
+  representing HTTP messages. [Reference here][psr-http].
+* This means that `setHeaders()` does not wipe out every existing header
+  anymore.
+* We also support multiple headers with the same name.
+* Use `Request::getHeaderAsArray()` and `Response::getHeaderAsArray()` to
+  get a hold off multiple headers with the same name.
+* If you use `getHeader()`, and there's more than 1 header with that name, we
+  concatenate all these with a comma.
+* `addHeader()` will now preserve an existing header with that name, and add a
+  second header with the same name.
+* The message class should be a lot faster now for looking up headers. No more
+  array traversal, because we maintain a tiny index.
+* Added: `URLUtil::resolve()` to make resolving relative urls super easy.
+* Switched to PSR-4.
+* #12: Circumventing CURL's FOLLOW_LOCATION and doing it in PHP instead. This
+  fixes compatibility issues with people that have open_basedir turned on.
+* Added: Content negotiation now correctly support mime-type parameters such as
+  charset.
+* Changed: `Util::negotiate()` is now deprecated. Use
+  `Util::negotiateContentType()` instead.
+* #14: The client now only follows http and https urls.
+
+
+2.0.4 (2014-07-14)
+------------------
+
+* Changed: No longer escaping @ in urls when it's not needed.
+* Fixed: #7: Client now correctly deals with responses without a body.
+
+
+2.0.3 (2014-04-17)
+------------------
+
+* Now works on hhvm!
+* Fixed: Now throwing an error when a Request object is being created with
+  arguments that were valid for sabre/http 1.0. Hopefully this will aid with
+  debugging for upgraders.
+
+
+2.0.2 (2014-02-09)
+------------------
+
+* Fixed: Potential security problem in the client.
+
+
+2.0.1 (2014-01-09)
+------------------
+
+* Fixed: getBodyAsString on an empty body now works.
+* Fixed: Version string
+
+
+2.0.0 (2014-01-08)
+------------------
+
+* Removed: Request::createFromPHPRequest. This is now handled by
+  Sapi::getRequest.
+
+
+2.0.0alpha6 (2014-01-03)
+------------------------
+
+* Added: Asynchronous HTTP client. See examples/asyncclient.php.
+* Fixed: Issue #4: Don't escape colon (:) when it's not needed.
+* Fixed: Fixed a bug in the content negotation script.
+* Fixed: Fallback for when CURLOPT_POSTREDIR is not defined (mainly for hhvm).
+* Added: The Request and Response object now have a `__toString()` method that
+  serializes the objects into a standard HTTP message. This is mainly for
+  debugging purposes.
+* Changed: Added Response::getStatusText(). This method returns the
+  human-readable HTTP status message. This part has been removed from
+  Response::getStatus(), which now always returns just the status code as an
+  int.
+* Changed: Response::send() is now Sapi::sendResponse($response).
+* Changed: Request::createFromPHPRequest is now Sapi::getRequest().
+* Changed: Message::getBodyAsStream and Message::getBodyAsString were added. The
+  existing Message::getBody changed it's behavior, so be careful.
+
+
+2.0.0alpha5 (2013-11-07)
+------------------------
+
+* Added: HTTP Status 451 Unavailable For Legal Reasons. Fight government
+  censorship!
+* Added: Ability to catch and retry http requests in the client when a curl
+  error occurs.
+* Changed: Request::getPath does not return the query part of the url, so
+  everything after the ? is stripped.
+* Added: a reverse proxy example.
+
+
+2.0.0alpha4 (2013-08-07)
+------------------------
+
+* Fixed: Doing a GET request with the client uses the last used HTTP method
+  instead.
+* Added: HttpException
+* Added: The Client class can now automatically emit exceptions when HTTP errors
+  occurred.
+
+
+2.0.0alpha3 (2013-07-24)
+------------------------
+
+* Changed: Now depends on sabre/event package.
+* Changed: setHeaders() now overwrites any existing http headers.
+* Added: getQueryParameters to RequestInterface.
+* Added: Util::negotiate.
+* Added: RequestDecorator, ResponseDecorator.
+* Added: A very simple HTTP client.
+* Added: addHeaders() to append a list of new headers.
+* Fixed: Not erroring on unknown HTTP status codes.
+* Fixed: Throwing exceptions on invalid HTTP status codes (not 3 digits).
+* Fixed: Much better README.md
+* Changed: getBody() now uses a bitfield to specify what type to return.
+
+
+2.0.0alpha2 (2013-07-02)
+------------------------
+
+* Added: Digest & AWS Authentication.
+* Added: Message::getHttpVersion and Message::setHttpVersion.
+* Added: Request::setRawServerArray, getRawServerValue.
+* Added: Request::createFromPHPRequest
+* Added: Response::send
+* Added: Request::getQueryParameters
+* Added: Utility for dealing with HTTP dates.
+* Added: Request::setPostData and Request::getPostData.
+* Added: Request::setAbsoluteUrl and Request::getAbsoluteUrl.
+* Added: URLUtil, methods for calculation relative and base urls.
+* Removed: Response::sendBody
+
+
+2.0.0alpha1 (2012-10-07)
+------------------------
+
+* Fixed: Lots of small naming improvements
+* Added: Introduction of Message, MessageInterface, Response, ResponseInterface.
+
+Before 2.0.0, this package was built-into SabreDAV, where it first appeared in
+January 2009.
+
+[psr-http]: https://github.com/php-fig/fig-standards/blob/master/proposed/http-message.md
+[rfc-7240]: http://tools.ietf.org/html/rfc7240