Patch in https://github.com/tinymce/tinymce/commit/eb27b828947afaf050965c377f6d769e133eebcb and https://github.com/tinymce/tinymce/commit/cd84a63d4addf27c60ef32dcbe1a49bbee30150a
Allow additional values for mediaplayer and map HTML5 video/audio attributes
Fix ms background gradients