TinyMCE: update to 4.0.28+. Includes all changes until 09-06-2014: https://github.com/tinymce/tinymce/tree/32cb108d41b27265c60a8bc1f62855fdfb61e486. Changelog: https://github.com/tinymce/tinymce/blob/32cb108d41b27265c60a8bc1f62855fdfb61e486/changelog.txt.
See #28391.

git-svn-id: https://develop.svn.wordpress.org/trunk@28768 602fd350-edb4-49c9-b593-d223f7449a82