Add endpoint to get service date range for feed
Add error handling to service-dates endpoint
Add travel time performance indicator
Broke observed params out for refactor
Merge pull request #279 from moradology/feature/traveltime-performance

Add travel time performance indicator - creating issue for exploration of a simpler map from trip ID to observed 'real-time' trip
Fetch feed service dates in settings configuration
Fix InterstopDistance indicator and add test for ad-hoc system
Add comments about limits of InterstopDistance indicator
Merge pull request #281 from WorldBank-Transport/feature/stops-over-length-test

Fix InterstopDistance indicator and add test for ad-hoc system
Verify representative dates chosen are within feed serivce date range
Merge pull request #286 from flibbertigibbet/feature/check-date-range

Feature/check date range