Add RealTime/RealTimeProblem models + migration
Add UI for Real-Time Upload

TODO: Add geotrellis endpoint for importing the Real-Time data
Calculate, save stops buffer in database -untested

This adds a trait that allows indicators to calculate a stops buffer and
save it to the database. The current stops buffer in the database will
be retrieved if it already exists. This is untested code.
Add 500m coverage ratio indicator
Add StopsBuffer indicator test

Plus refactor and cleanup.
Add merge datasources migration for merge conflict
Add city_name to RealTime
Add gtfs_realtime app with realtime import celery task
Display RealTimeProblems in settings UI
Add debug and fix django reference to suburban-ratio
Add basic tests for RealTime
Merge pull request #182 from WorldBank-Transport/feature/real-time-upload

Feature/real time upload
Merge pull request #189 from moradology/feature/fixHangingIndicator

Add debug and fix django reference to suburban-ratio
Get tests + indicator calculations working
Merge branch 'feature/store-stop-buffers' into develop

Conflicts:
	geotrellis/src/main/scala/indicators/RatioSuburbLines.scala
Delete tmpdir files after celery job
Add OSM and transit to road ratio;fix indicator names