Added proper tags

Tags are not a blob of strings anymore
Admin can enter tags more easily, beautiful and robust
This enables filtering, finding objects with similar tasks, etc. in
future updates

Also added many stylesheets etc. ( these came after "python manage.py
collectstatic" as per the setup instructions for taggit-autosuggest)
Merged from leberwurstsaft/tags
Merge pull request #15 from leberwurstsaft/tags

Added proper tags
Merge pull request #16 from cknoll/tags

Merge Tags