Fixes:
Route based configuration:
- no RT vehicle positions when trip_id or route_id are missing from the feed, addresses #229
Local stop configuration:
- When configuring options in the entity for max local stops, the configured value was not taken into account, it continued to use DEFAULT_MAX_LOCAL_STOPS, addresses #228
Other:
- library update to 'io'
- improve efficiency (performance a bit) by reducing charset guessing in the RT code
- adding testcases in support of RT vehicle location