createInstructor needs to be implemented using test data

[hannahcoonley]

For me

[scott-s-douglas]

Create SWAPRinstructor on APIary: https://jsapi.apiary.io/previews/swaprnode/reference/instructor-creation/instructor-endpoint/create-swaprinstructor

[scott-s-douglas]

In our permissions model, instructors have full permission within their courses but cannot create courses (only admins can create courses). Instructor A, who has authority over courseA, can:

1. Create a new instructor account which inherits all the permissions of A
2. Promote an existing user account to an instructor account which inherits all the permissions of A
3. Create a new session of courseA
4. Enroll and remove students from any session of courseA
5. Create assignments and add them to courseA
6. Instantiate any assignment in courseA to any section in courseA
7. View all data about students in courseA

This task involves the implementation of 1 & 2