Return a human-readable error message rather than an exception when GTFS-realtime export fails.
Prevent exception when rendering GTFS-realtime alerts which lack time window or affected entities.
Merge pull request #71 from kurtraschke/gtfs-rt-export-fixes

GTFS-realtime export fixes
Merging NYC-specific TDS methods into core TDS in the least invasive way
possible.  Providing trivial implementations for default operation,
which can be override by spring or by sub-classing.
Bumping version for easier testing; adding component hint to spring to
fix dependency issues.
reverting pom version
Merge pull request #72 from sheldonabrown/master

OBANYC TransitDataService merge
Merge branch 'master' of https://github.com/OneBusAway/onebusaway-application-modules