Code Review changes.
Changing the if else in submission for clarity.
Deleting the base error in submissions mixin.
Merge pull request #42 from edx/sanchez/base_template_cleanup

Some additional doc around all the functions in the front end.
Merge branch 'master' into sanchez/TIM-171-Submission-UI

Conflicts:
	apps/openassessment/xblock/submission_mixin.py
Creating a number of templates for response. Requires cleanup.