Added login function and subdict helper function.
Added bike checkout.
Added checkin API call.
Removed extraneous fields.
Added functions to get and send bike position.
Fixed variable name in json file.
Standardized on using 'lon' instead of 'long' as a variable name.
Improved documentation for REST functions.
Removed unnecessary functions.
Removed references to zone_id.
Renamed 'location' to 'address'.
Fixed errors in documentation.
Removed unneeded dummy data files.
Typo corrections.
Merge pull request #4 from bikeshare/pfaffle_rest

Added POST API calls