Add pry-byebug
Update route_config fixtures and tests. Fix #1

* Fixtures and tests updated to use TTC data (c.2014)
* In `Nextbus::Client.stops`, return all stop information (previously just returned `tag`)
* In `Nextbus::Stop`, change `:id` accessor to `:stop_id` (to reflect what is actually present in NextBus XML response)
* In `TestStop#test_find`, search by `stop_tag` and assert that it got the right `stop_id`. This test previously passed by coincidence since in Boston `stop_id == stop_tag`. In Toronto, these numbers are different.