Add check for shapes.txt and no shapes_dist_traveled

This adds a warning message to the import process if
both a shapes.txt and no shapes_dist_traveled are available
since length for routes and modes will not be available.

Note: In developing this, no gtfs files with a shape_dist_traveled,
but no shapes.txt file were able to be found.
Merge branch 'develop' of github.com:WorldBank-Transport/open-transit-indicators into develop

Conflicts:
	python/django/datasources/tasks/gtfs.py
added logback logging
Add filter for multiple indicator aggregations
Merge pull request #165 from WorldBank-Transport/feature/add-aggregation-filter

Add filter for multiple indicator aggregations
Add check to not use filter if no values provided

The filter should not be used if the query parameter is
not used. This was causing problems with deleting.
Remove truthiness check on route_type.

Zero is a valid value (for tram).
Merge pull request #167 from flibbertigibbet/feature/fix-route-type-truthiness

Remove truthiness check on route_type.
Merge pull request #166 from WorldBank-Transport/feature/fix-aggregation-filter

Add check to not use filter if no values provided
Set gunicorn timeout.

Allows for accessing large indicators API response.
Increase celery indicator timeout (Madrid hit it)
Set nginx read timeout for API.

For fetching large indicator results.
Implement system-level calculations
Merge pull request #170 from WorldBank-Transport/feature/system-calculations

Implement system-level calculations
Merge pull request #169 from flibbertigibbet/feature/load-madrid

Feature/load madrid
Send config values for use in calculators
Merge pull request #171 from WorldBank-Transport/feature/send-config-values

Send config values for use in calculators
Remove workaround for obtaining SRID

The fix for the missing SRID problem has been merged into GeoTrellis
Add indicators is_latest_version filter
Update indicator-job to allow for multiple is_latest_versions

Needed in order to properly filter the indicator versions
based on version and city_name for the indicator map and data
pages.

The django.conf.settings.OTI_CITY_NAME should be temporary,
and will be replaced by a user-defined default for the
app's uploaded city name.

Updated the indicator-version endpoint to return all current valid
city_name/version combinations, which included uploaded comparision
indicators.

Set is_latest_version = True only on successful indicator csv import