Fixes #5 - Adding Questions to the project

@gholtslander

I've added code that will handle creating and using the questions for the survey. Unit tests included! Just waiting for the last half of the mappings. I wonder if I can look it up online or something...
Forgot to commit the important bits... the Entity class and the tests for such
Adding some docstring
Finished adding the mappings for question categories
Merge pull request #7 from holtscomm/questions-table

Fixes #5 - Adding Questions to the project