Moved trailheads retrieval from CartoDB to trailsyserver API
Changed trailhead property: cartodb_id -> id
Now getting trail data & segments via API
Put trailsegment fetching after traildata fetch for now to speed up startup.
now pointing to API server
initial updates for DS 0.3.1
Testing domain detection on heroku.
Test for prod/test location and use correct API server.