Merge pull request #68 from rlobo3/master

Added CreateClass pages and methods
Finished work on adding a class.
Merge pull request #69 from jwien001/master

Finished work on adding a class.
Created a separate Class controller.
Implemented modifying class names.
Merge pull request #70 from jwien001/master

Further work on classes.
Implemented deleting Problems.

In the process, I created a reusable confirmation dialog that can be
used similar to Html.BeginForm. See Views/Problem/Edit.cshtml for an
example of how it works.
Merge pull request #71 from jwien001/master

Implemented deleting Problems.
Implemented deleting Problem Sets.
Merge pull request #72 from jwien001/master

Implemented deleting Problem Sets.
Implemented deleting Classes.
Fixed bug when adding prereqs.

Any prereqs added to a set without any prereqs were getting deleted
immediately after being added.
Moved JoinClass action into ClassController.
Merge pull request #73 from jwien001/master

Deleting classes and a couple of bug fixes.
Students can no longer add a Problem to a Set.
Merge pull request #74 from jwien001/master

Students can no longer add a Problem to a Set when creating a problem.
Added several PyInterpret features

Time limit to code runtime, recursion depth protection, and professor
code handling
Now centered around localhost:13500/Home/Home