Version 3.0

A hefty refactor of the MediaCore Moodle plugin.

- Consolidated the plugin for Moodle 2.3 and 2.4 and above.
- Filter and Repository now use MediaCore API2.
- Config uses a MediaCore `hostname` parameter instead of a `url`.
- Added a DB migration to transfer url entries to hostnames.
- Added Zend_Uri_Http libraries to abstract out dealing with url components.
- All API logic moved to the `mediacore_client` class.
- Embeds are now sized to the size of the embedded thumbnail so they can be resized via the tinymce rich text editor.
- Add some extra LTI params to help track plugin use and moodle course information.
- Updated the plugin to v3.0 (2014052100)