depend fully on pkg-config
travis: verbose install - refs #28
travis debugging: print details for pkg-config libosrm
Travis debugging: dump out all pkgconfig files
use osrm fork to test pthread fix
keep using rpath for linux in case OSRM starts providing shared libs
switch back to main develop branch now that https://github.com/DennisOSRM/Project-OSRM/pull/849 has landed
Merge pull request #28 from DennisOSRM/pkg-config

depend fully on pkg-config