Wrote out description of users controller spec

Wrote spec to test that success has http status code of 200

'POST /users' route is returning 200 correctly

Removed some unnecessary rspec requires in Rakefile

Removed neo4j reference in Rakefile that was breaking rake

The create user route is adding a user to the database

Rspec itself doesn't let you test assigns :(

Realized I had the wrong idea on the response body for POST /users

Posting a new user returns the user_id

The POST /users route is working according to the spec.