Updates for TinyMCE 4.x

* cancelEnter is not needed (handled by keyDownEvent handler)
* moving to 4.x events (more info at
http://www.tinymce.com/wiki.php/Tutorial:Migration_guide_from_3.x)
* keyPressEvent is not needed
* removing unnecessary call to matchingOptions() in keyUpEvent (taken care of in populateList())