Integrated django-rosetta and created initial po file
Move existing site utility code to utils instead of models.
First pass at tracking translation updates.
Update TranslatableMixin to create TODO records when items are updated.
Fixes to the TODO creation and first pass at listing all TODO items.
Disable the delete action and add action to mark items as resolved.
Include the initial migration for the translation TODO items.
Tests for the creation of TODO items in the admin. Fixes for deleting items.
Marked Simplified Chinese for translation using the no-op
Render language selection form in the footer.
Update to use the built-in Django view for changing the user's language which will in turn change the site.
Merge branch 'master' into feature/django-rosetta-integration

Conflicts:
	project/settings/base.py

The conflict in base.py is having rosetta as an installed app
in place of the translations app. Made sure both apps now appear
in the installed apps section.
Change the name of the field label from create to date.
Restore the site permission selection in the user admin.
Make sure the checkbox isn't wrapped in a link since Firefox will follow the link if the checkbox is clicked.
Don't create additional edit TODOs if there are existing unresolved ones for the page. Resolve other existing TODOs when an item is deleted.
Add new section on managing site translations.
Merge pull request #168 from mozilla/162-translation-docs

First Pass at Translation Docs
Merge branch 'master' into feature/django-rosetta-integration
Work on #150; Add Rosetta link to Mezzanine-grapelli admin