Code submissions should be sent to Django, not directly to the Engine

[bazadactyl]

At the moment, when the user submits code on the website, the request is sent directly to the Engine. This is bad because Django is out of the loop. It has no way of knowing about what users are submitting. This issue will be deemed resolved when:

• the engine is installed on our server
• code submissions are sent directly to Django
• Django submits users' code the Engine
• Django processes the Engine's response and sends the appropriate response back to the user
• Django saves information about the submission into the database