Add EdgeLabel class for keeping cost/predecessor info during A*. Add
pbfgraphbuilder for testing.
Remove stxxl include
Remove pbfgraphbuilder for now. Needs osmpbf
Change tests to use libvalhalla.la
Merge pull request #20 from mapzen/dwn

mjolnir
Merge branch 'master' of https://github.com/mapzen/valhalla into gdg

Conflicts:
	Makefile.am