Added Category Insertion

Added code to insert category into the sql db and return the id.
added Neo4j Skeleton and Updated Database Schema

Added some bare skeleton code for the neo4j database class and updated
the database schema to include a questiontype column. Allowing for easy
determination of a questions type and expected answer.

It may be better to split this question type into a seperate table with
Question ID so that a single question can be answered as one of various
types,