Update init_tinymce4.html

add 'menubar : false' in tinymce_options
Merge remote-tracking branch 'niklaushug/master' into next

* niklaushug/master:
  Update init_tinymce4.html
AUTHORS update
Switch the default rich text editor to a CDN-served version of TinyMCE 4

Also add documentation on how to activate CKEditor while at it.