Merge pull request #968 from flamholz/master

Stop using strings to store from, to and intermediate locations in RoutingRequest.
Remove methods from StreetVertexService that are now unused.
Delete wheelchair accessibility code too since it doesn't belong and was not used.
Add getters/setters on RoutingRequest for to/from GenericLocations.
Use new setter methods.
Merge remote-tracking branch 'upstream/master'