In the docs, mention that FEINCMS_RICHTEXT_INIT_TEMPLATE needs to be set...

... if using TinyMCE 4.x

When using TinyMCE 4.x the user has to set FEINCMS_RICHTEXT_INIT_TEMPLATE to the init_tinymce4.html template for the rich text content to work correctly.

This pull request should also be merged into the next branch.

Cheers
   Adi