Fixed #176 -- Disallow multiple TaggableManagers with the same through model.
prefetch_query_set was also renamed to prefetch_queryset
reverse to make the current standard of 'queryset' the default
Exclude tests/ from install
Added tox file.
Merge pull request #181 from rizumu/get-prefetch-queryset

Get prefetch queryset
Typo.
Update api.txt

Minor fix, 'slugs' is a method bound to TaggableManager
Merge pull request #194 from krmboya/patch-1

Update api.txt
Merge changes from shacker/django-taggit which was created against an older version of taggit.
add missing init.py in management/commands
Merge pull request #1 from grobertson/lowercase-manager

Add setting to force lowercase tags