Check that we are not at the end of the bucket list when
clearing (was causing a crash).
Merge remote-tracking branch 'origin/master' into dwn
Ready to test the A* algorithm at its simplest form!
Benchmark for adjacency list
Merge remote-tracking branch 'origin/master' into dwn

Conflicts:
	Makefile.am
Merge branch 'dwn'
Merge branch 'master' of https://github.com/mapzen/valhalla into gdg