Adds GPX trace mode and filename prefs
Simulated routing via gpx trace
Adds debug setting for location update interval

Useful for speeding up mock routing replay
Disables mock mode after finishing mock gpx route

Requires https://github.com/mapzen/LOST/pull/5
Merge pull request #236 from mapzen/peter/pin_from_list

Peter/pin from list
reactiviate tests and removes bogus test
Merge pull request #234 from mapzen/chuck/mock-gpx-traces

Simulated routing via GPX trace
removes unused import
Merge pull request #237 from mapzen/baldur/a_literal_corner_case

reactiviate tests and removes bogus test
resolves routing arrow not moving along with routing
Merge pull request #240 from mapzen/peter/routing_fix

resolves routing arrow not moving along with routing
removes overflow menu on search