Add test for viewing/saving history form
Add test for viewing/saving history form

Fixes gh-20.

emergence/django-simple-history,luzfcb/django-simple-history,treyhunner/django-simple-history,treyhunner/django-simple-history,luzfcb/django-simple-history,emergence/django-simple-history,pombredanne/django-simple-history,pombredanne/django-simple-history