initial commit for seating chart
Added sql file for postgres datbase schema
User usernames instead of userid in seat chart database and return usernames when getting grades
Renamed userID to studentID in JSONStudent
Merge setSeats  and seating chart schema from withoutBlackboard branch
Dont remove get method for POJO because jackson can't serialize
Merge pull request #8 from The-Learning-Track/seatingChart

Finish Implementation of Seating chart