change tagging to taggit INSTALLED APPS
Use taggit (TaggableManager) on article models
Add field tags on Post Admin (articles)
Change tagging to taggit on dev settings
fix bug change tagging to taggit version 0.10a1 on install requires setup file
Merge branch 'taggit' of github.com:oppsproject/opps

Conflicts:
	opps/core/__init__.py
	setup.py