Fix display of route line color on map

* Previously the route line color was hard-coded to a constant line color defined in resources file.  Now, the color provided via the OBA REST API for a route (which is defined in GTFS data) is used for the color on the map.
* Also adds support for route text color define by OBA REST API response (GTFS data), although it currently isn't used in OBA Android yet
* Add a test for both default and color set via the API response