Provide complete, TA repo that passes tests

[frozenfrank]

Overview

TAs want to have a communal repo of code that passes the tests. This increases our ability to validate that changes to testing code work.

Discussion

This goal is made difficult because the autograder currently accepts only public repos. Adding a public "answer" repo to this organization would be very bad. We could try to give the autograder access to a private repo. Storing the repo in a different organization makes it difficult/non-sustainable for general TA use.