New release checklist
---------------------
*  Build YUI module (if modified):
   `$ cd yui/src/videojs`
   `$ shifter`
*  Validate `styles.css` via <http://jigsaw.w3.org/css-validator/>
*  `php -l` on all php files individually.
*  Run the Code checker Moodle plugin on `mod/videofile` (exclude
   `mod/videofile/video-js-4.6.3,mod/videofile/yui`).
*  Push to Github.
*  Draft a new release on github (e.g. "v1.00").
*  Download code (zip).
*  Go to <https://moodle.org/plugins/view.php?plugin=mod_videofile>,
   click on the "Add a new version" link in the administration block
   bottom right.
   *  Add zip file.
   *  Check "Rename root directory".
   *  Check "Auto remove system files".
   *  Check "Rename README".
   *  Select Moodle 2.4-2.7 in the select box.
   *  Click "Continue".
   *  Add change log to release notes (could be several versions).
   *  Add "Change log URL" (click on the CHANGELOG in Github to get url).
   *  Add "Alternative download URL" (get the URL from the releases page on Github).
