Add scala stub endpoint for scenario creation
Add django model, endpoint, and task for scenario
DRY out sending authorized requests
Implement GTFS database copying for new scenario
Fix test
Disallow alltime scenarios and remove prints
Add tests for scenario creation
Add create and modify datetimes to scenario model
Fix typo
Move scala endpoint strings to settings
Grab default db name from settings
Merge pull request #310 from WorldBank-Transport/feature/scenario-db

Scenario creation - server-side components