add additional m4s for posterity
Merge remote-tracking branch 'origin/master' into kk_m4
Merge pull request #17 from valhalla/kk_m4

add m4s
Fix a bunch of issues with the pbf graphbuilder. Now creates a connected
graph it seems.
Remove sparsetable stuff for now.
Merge pull request #18 from valhalla/dwn

pbfgraphbuilder Fixes