Fix Average Service Frequency indicator
Add ad-hoc system test for Average Service Frequency.
Merge pull request #266 from WorldBank-Transport/feature/fix-asf-indicator

Fix Average Service Frequency indicator
Move calculators to sub-directory
Refactor paramaters into sub-directory
Reproject demographic grid after import
Add query to return a map of stopId -> polygon(buffer)
Add Accessibility indicator
WIP test-fix
Add accessibility indicators only if data is available
Add selection of destination metric to demogrpahics table
Add tests and test data for Accessibility calculators
Fix bug in check for indicator kick-off