Optionally include user's activity in the user stream.
Get action instance on action.send
use force_insert w/ newactions
Merge branch 'master' of https://github.com/dimier/django-activity-stream into feature/159-with-user-activity

Adds docs/tests to close #159

Conflicts:
	actstream/actions.py
Merge branch 'feature/159-with-user-activity' into develop