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

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+sabre/event
+===========
+
+A lightweight library for event-based development in PHP.
+
+This library provides the following event-based concepts:
+
+1. EventEmitter.
+2. Promises.
+3. An event loop.
+4. Co-routines.
+
+Full documentation can be found on [the website][1].
+
+Installation
+------------
+
+Make sure you have [composer][3] installed, and then run:
+
+    composer require sabre/event "~3.0.0"
+
+This package requires PHP 5.5. The 2.0 branch is still maintained as well, and
+supports PHP 5.4.
+
+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) |
+
+
+Questions?
+----------
+
+Head over to the [sabre/dav mailinglist][4], or you can also just open a ticket
+on [GitHub][5].
+
+Made at fruux
+-------------
+
+This library is being developed by [fruux](https://fruux.com/). Drop us a line for commercial services or enterprise support.
+
+[1]: http://sabre.io/event/
+[3]: http://getcomposer.org/
+[4]: http://groups.google.com/group/sabredav-discuss
+[5]: https://github.com/fruux/sabre-event/issues/