Updated TinyMCE to 4.1.3

BlueSpice VisualEditor now uses TinyMCE 4.1.3. This should, among other
things, bring background colors back to table cells.

Change-Id: Ic75ca534dc2e55f1b12fed6361de78de7789c4e0
Merge "Updated TinyMCE to 4.1.3"