elFinder integration with tinyMCE 4

The configuration files need to be updated to include the filemanager
stuff, so this is not tested for tinyMCE4 yet.

According to the documentation, the difference between TM3 and TM4 is
that in the tinyMCE init the elFinderBrowser should not have the
quotations
http://stackoverflow.com/questions/16016870/tinymce-4-with-elfinder