Merge branch 'feature/issue-85-so-that-I-can-communicate-to-all-district-staff-as-a-RTS-staff-role-I-can-send-sms' into feature/issue-90-refactor-send-to-sms-zones-code-to-fix-known-bugs

Conflicts:
	sms/admin.py
added created_by_da field to PerformanceData and set null=True for it and created_by
did schemamigration for model change
updated test utils to create DistrictUserAdmin
added related key to teacher performance data
wrote unittest for teacher performance data
updated tests for teacherperfomance created to account for created by district admin
added created_by_da to api and set created_by to null
wrote unittest for learner perfomance data
added fixture for create district admin
wrote initial tests for creating district admin
updated the menu for create district admin
added the get district fixture
adding the districts object to the config
wrote test for selecting district
wrote code for entering districts.
added code for first name
updated code for entering first name
created the enter surname unittest
made the enter surname unittest pass