Related Issues : #17 #25

The Question or Assignment model needs to be updated with a new field base_code.
Used by Moss for ignoring student submissions which match with it.

Additional Context
Different Templates can be provided to professors for easier usage. For e.g
A C++ base code may contain following content.

#include <iostream>
#include <vector>
#include <string>
...

Similarly a Java base code may look like

import static java.lang.Math.pow;
...