Controller for receiving new user information

[calstatelaacm]

• Add a new controller for POST request for a human user. (Make sure to properly document it in Wiki).
• Create a new class called HumanUserPostData.java so its easy to manage the data received through the POST request (Look at SsuPostData.java and SimpleStatusUpdate.java and how they are related)
• You will also have to implement RowMapper class for HumanUser (look at the RowMapper inside the SSU class for example)
• Once the request is received, upload the user information to database.
• Return -1 if failed to create new user.
• Return the userId if successfully created new user.