pull in osm-binary as submodule so we can use the proto definitions there for the osm pbf format. turn pbfgraphbuilder back on. use pattern rule to make protobuf generation less verbose. pray that travis build doesnt fail.
merge upstream and resolve conflicts
remove header pbfs from built sources
fix up travis build as apparently its autotools isn't as nice as ubuntus
Merge pull request #44 from mapzen/kk_osmpbf

add osm pbf format for Mjölnir
Merge branch 'master' of https://github.com/mapzen/valhalla into gdg