Release 0.10.0

Support for Django 1.7 and migrations
Move from django-tagging to django-taggit
My thought was to include them to run any south migrations that had not been run on an installation and then to stop using south and use django migrations. Perhaps a better plan is to just be clear in the instructions to install the latest 0.9.x and run the south migrations and *then* upgrade to 0.10.0?