Added support for ManyToMany fields as well as applying filter_horizontal to them.
Made admin.py modifications thread-safe.

Conflicts:
	src/cms/apps/pages/admin.py
Cleaned up conditional statement.

Conflicts:
	src/cms/apps/pages/admin.py
Updated media app to use the new word truncator.

Conflicts:
	src/cms/apps/media/admin.py
Greatly improved ManyToMany fields in ContentBase models.

Conflicts:
	src/cms/apps/pages/admin.py
Refactored ManyToMany code to bring it into a single loop.

Conflicts:
	src/cms/apps/pages/admin.py