add streetless linking in threaded heuristic classes
simpletransfer: add serial id, forbid two in a row, weightLowerBound
threaded bidi heuristic: add abort method, remove cutoff parameter
do not clamp max transfers
add simplified single-itinerary path service
revise threaded heuristic (transit only, separate street searches)
set boarding costs and slack; stub path parser
fix exceptions in itinerary generator (should really use path parser)
add debug code
implement pathparser
walk more
remove double-transfer protection from simpleTransfer (use parser)
spew less output
remove hard-coded linking radius
remove hardcoded options, can be accomplished w/ prototypeRoutingRequest
add threaded bidi heuristic factory (static inner) class
move OSM tiles before Mapbox tiles (Mapbox now requires registration)
only use threaded bidi heuristic for transit
return trivial heuristic value for temporary vertices 

(alleviates issues with concurrent identical searches)
Merge pull request #954 from benmoovit/master

fix #947