added naive tag deletion
better errors on clean_tags
fixed blank exception
Merge pull request #12 from Rethought/delete-tags-command

added naive tag deletion
CHERRY-PICK: Added functionality for getting tag weight.
Updated unit test for the same.

Conflicts:
	src/tagman/models.py
Breaking down unit test in small chunks.
Fixed failing unit tests: sys_objects and public_objects were pulling archived tags by default. Updated the manager to set archived=False
Merge pull request #6 from maclinkallat/story/tag_cloud_cherry_pick

Story/tag cloud cherry pick
Add possibility to pass models to select from when getting tagged items
Change version number
Allow tagman to return model querysets unevaluated
incremented version number
Merge pull request #7 from UKTV/include_not_exclude_carles

Add possibility to pass models to select from when getting tagged items
merged develop
Fixed tests
PEP8
Remove merge mistake
Merge pull request #8 from UKTV/move_to_querysets

Move to querysets
Merge branch 'develop'