Merge branch 'feature/issue-8-regsitration-data-submitted-via-api' into feature/issue-10-perfomance-assessment-data-can-be-submitted-via-api
added the teacher perfomance model
did schemamigration for the teacher perfomance data
Registered Teacher Perfomance with admin
added teacher perfomance data to API
registered teachers perfomance data with url
wrote models for LearnerPerfomanceData
did schemamigration for learner perfomance
added learner perfomance to admin
added learner perfomance to api
added learner perfomance data to urls
made basic unittests
updated models to include blank fields with no validation
wrote unittests for teacher and learner perfomance data
fixing testing bug where the if two functions are in the same Test class the primary key autincrements
updating comments
undoing null = True changes
added the created_at list_display to admin
Merge branch 'develop' into feature/issue-10-perfomance-assessment-data-can-be-submitted-via-api

Conflicts:
	data/admin.py
	data/api.py
	data/models.py
	data/tests/test_api.py
	data/urls.py
Added model AcademicAchievementCode