Added a test to demonstrate usage of an alternate history base class
Add base class override
Facted to allow multiple abstract bases for historical models
Extended bases override support to the register utility
Address comments
Added casting to tuple to historical 'bases' init parameter
Make bases type error more cohesive
Make sure single classes to bases fail as well
Merge pull request #98 from macro1/model-inheritance

Add override for historical model base classes
Note custom base classes in CHANGES file
added management command for saving of current data in its corresponding history table
Moved command into the correct packages
First test for command to auto populate initial history
Only require existence of '--auto' option
Reverted broken 'auto' parameter
Added test for specific model repopulation
Cleanup IO for command tests
Make model arguments app specific
Make populate history command and tests work in all supported environments
Cleanup