Appearance: Added "graded by" section to grutor page for a problem
Appearance: Added "graded by" section to grutor page for a problem

Requested by Prof Keller. Right now, it will just show the grutor who is
currently on the problem, since this value is updated as soon as the problem is
selected. Hopefully will be expanded to show the history of who has worked on
the problem in the past.

CSGreater-Developers/HMC-Grader,noellekimiko/HMC-Grader,noellekimiko/HMC-Grader,CSGreater-Developers/HMC-Grader,CSGreater-Developers/HMC-Grader,noellekimiko/HMC-Grader,noellekimiko/HMC-Grader,noellekimiko/HMC-Grader,CSGreater-Developers/HMC-Grader,CSGreater-Developers/HMC-Grader,noellekimiko/HMC-Grader