add a slightly modified osrm-frontend...

[MoKob]

... to allow querying transit routes (at 12:00:00 only).

Resolves https://github.com/mapbox/directions-transit/issues/63

To result in a reasonable view, we need to implement:

• [x] annotation of lines tracked in https://github.com/mapbox/directions-transit/issues/98
• [x] maybe some separation of the legs into dedicated segments - the depart/arrive part does this somewhat. But we might want some improvements later on.
• [x] make instruction types (deboard/board/stay in vehicle) recognised: using depart/arrive for now

Bases on #103 to improve connectivity

Basic view, querying a route:

Bugs:

• [x] cannot click the map to set a waypoint. Need to use geo-coding to set initial waypoints

[MoKob]

The map wasn't clickable due to the order in which the creation was specified. The order seems to haven been the same on map.project-osrm.org which makes me wonder why it didn't work locally.

[jqtrde]

Codecov Report

Merging #102 into master will decrease coverage by 0.02%. The diff coverage is 95.12%.

@@            Coverage Diff             @@
##           master     #102      +/-   ##
==========================================
- Coverage    95.8%   95.78%   -0.03%     
==========================================
  Files         122      122              
  Lines        2505     2539      +34     
  Branches      226      227       +1     
==========================================
+ Hits         2400     2432      +32     
- Misses         17       18       +1     
- Partials       88       89       +1