GS v3.3.0 - CKEditor has problems in IE11

[Cerulean]

Great to see the v3.3.0 release, which brings CKEditor up to v3.6.6. But this version of CKEditor is a bit out-of-date and has a number of problems with Internet Explorer v11.

See: http://ckeditor.com/forums/CKEditor/Bugs-in-IE-11

IE11 compatibility requires CKEditor v4.3 or higher: http://dev.ckeditor.com/milestone/CKEditor%204.3

If CKEditor was integrated with GetSimple in the form of a pre-installed plugin it might be easier to issue updates for the editor separate from the rest of the GS core. That seems to be the approach taken in the other CMSs I have used.