Added the ability to set a custom history_date.
I fixed the example for a custom history_date, as it was refering to
my_poll.history_date instead of my_poll._history_date.
I also rewrote the documentation to make it better understandable.
Run django.setup() in runtests
Don't use get_user_model in models.py file
Fix broken import in Python 3
Note broken line in Django 1.7
Fixed import of datetime.now as noticed by treyhunner.
Remove verbose_name and DB table fixes for 1.7
Fix admin site tests for Django 1.7
Update Django 1.6 version in tests
Upgrade Django versions in tox
Update Django version tests in Travis file
Remove deprecated test runner for Django 1.8
Added screenshots to documentation (issue #52)
Merge pull request #89 from bjdixon/master

Added screenshots to documentation (issue #52)
Add @bjdixon to AUTHORS file
Merge branch 'master' of github.com:treyhunner/django-simple-history
Test that history_date is correct on update
Merge branch 'set-custom-history_date'

Conflicts:
	CHANGES.rst
	docs/advanced.rst
	simple_history/models.py
	simple_history/tests/tests.py
Add @Dunedan to AUTHORS file.  Thanks!