Merge branch 'release/0.6.1'
Updated version number.
Reference db_table through content_type instead of content_object.
Bumped version number to 0.6.3
Return result of recursive snailtrack function
bumped version
moving timeout from 1 -> .250
version bump
snailtracker_enabled function and version bump
Merge branch 'master' into develop

Conflicts:
	django_snailtracker/models.py
Made mutex multi-server compat

Removed file mutex and moved it to the database using the ObjectLock
model.

Some code cleanup.