Default to agency ID of 1 for agencies without ID.

Fixes #217.
Intern agency_id string
Apply agency_id defaulting logic to routes
Merge pull request #277 from WorldBank-Transport/feature/allow-no-agency-id

Feature/allow no agency
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