Implemented login checking method.
Changed get stations API function to call Stations procedure.
Integrated Station Info function.
Re-implemented user login function using new S-Store procedure.
Changed station info function to have return values that make more sense.
Integrated active bikes API call.
Updated checkout bike procedure.
Updated checkin bike procedure.
Integrated bike info procedure.
Integrated bike position procedure.
Reorganized stations procedure.
Added statistics-gathering API call.
Altered checkin bike to check if a user does not have a bike.
Altered CheckoutBike to check if the user already has a bike.
Fixed bug in detecting no bikes for checkout.
Merge pull request #14 from bikeshare/sstore_integration

S-Store integration
Modified REST error checking to account for DB changes.
Added procedure for signing up new users.
Updated API to call the correct function to find active bikes.
Updated comments for what data is returned.