Minor pylint/whitespace changes
Add serial commas to modulestore definitions
Remove traling commas to make json valid
Add docstring to CourseDescriptor.__init__
Remove noop if statement
Clean up variable naming
Make SessionKeyValueStore variable names clearer
Remove unused template
Merge pull request #268 from edx/dhm/cosmetic-cleanup

Cosmetic Cleanups Incidental to Next Gen Modulestore Implementaton