Merge pull request #70 from treyhunner/iss59

Iss59
Add a Bitdeli badge to README
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.
Update advanced.rst

property.setter requires the function name be the same as property.getter when decorating the setter function.
Merge pull request #78 from dmckean/patch-1

Update advanced.rst
Cross-link admin integration to user tracking

Fixes gh-43.
Note importance of setter for user recording
Merge pull request #71 from bitdeli-chef/master

Add a Bitdeli Badge to README
Add test for unicode verbose_name
Fix unicode verbose_name bug

Fixes gh-76.
Merge pull request #80 from treyhunner/unicode-verbose-name-fix

Fix bug when verbose_name of model is unicode
Note verbose_name fix in CHANGES file
Merge pull request #79 from treyhunner/add-user-save-note-to-admin-docs

Cross-link recording user and admin docs
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