Evaluate lesson completion

[scowalt]

The system should have some method of checking for lesson completion that is unique to each lesson.

Example implementation: scripts are created and put in sysassets for each activity. When a user submits their code for compilation, the user's program is passed as a parameter into the script: ./activity1check ./user-program. The completion check script would return the output of the user code as well as some other indicator of whether or not the student accomplished the goal of the lesson.