Add initial directed edge class.
Fix duplicate
Merge remote-tracking branch 'origin/master' into dwn
Add AABBLL and lat,lng tiling support.
Merge pull request #6 from mapzen/dwn

Add initial directed edge class.
More general Tiles class (works with x,y or lat,lng)
Replace with tiles.h
Merge pull request #8 from mapzen/dwn

Move tilesll to tiles