Small style fix
Treat manager like an old-style class
Explicitly get queryset when using query methods
Treat ModelAdmin like an old python class
Specify ImportError class for exception handler
Removed some 1.3 compatability code
Stop overriding built-ins
Use loading module directly
Cleanup `history_form_view()`
Revert "Treat manager like an old-style class"

This reverts commit c5ed822f46d8ad09b5303ef24198e607d9c5dbd4.
Revert "Treat ModelAdmin like an old python class"

This reverts commit 669558204e5c7c6e806ffa41a2145b9b031d2c7b.
Merge pull request #134 from treyhunner/code-quality

Some cleanup
Retain empty docs/_static folder

Without docs/_static, `tox -e docs` fails with:

Warning, treated as error:
WARNING: html_static_path entry u'(path)/django-simple-history/docs/_static' does not exist
PEP8 fixes and ignores

tox -e flake8 now returns w/o errors
Allow overriding records manager class in register

By calling register(Model, records_class=Foo), a user can choose a
different class than HistoricialRecords to use for the manager.  A silly
example is included for tests.  A more serious example is at:

https://github.com/jwhitlock/web-platform-compat/blob/master/webplatformcompat/models.py#L38
Merge pull request #136 from jwhitlock/tox_fixes

Tox fixes
Change style of setting records_class default
Merge pull request #135 from jwhitlock/override_manager_in_register

Allow overriding records manager class in register
Switch order of checking for model_name vs module_name to stop
deprecation warning
Merge pull request #137 from jpulec/remove-django-1.8-deprecation-warning

Fix deprecation error for Django 1.8