Centralise loading of jquery in an included snippet, so we don't have to maintain the jquery version number in 5 places.
Add init_tinymce4 for tinymce 4.x (WIP)
Clean up init file for tinymce4.
Run tests with Django 1.4.2, as newer django-mptt requires that
Codify req on django >= 1.4.2 for django-mptt requiring that