Revert "Allow StationAdapter.to_triples to take splat args to filter by id"

This reverts commit c9cbc9bd9057c78b69cf24eef9224e98e32d9cc2.
Docs first. Add search near id example
Allow near to receive an id param and pass in hash to controller
Controller nearest accepts bike station id param and finds nearest stations
Station returns its position as a 2d point
Fix to use correct message
Remove unnecessary parenthesis
Tidys
Spec for Station.position method
Merge pull request #6 from rob-murray/find-near-station

Find near station
resolves #5