add tilehierarchy object to encapsulate the notion of the tile set. need to add more accessors and use in combination with the graphtilereader
resolve merge conflicts
remove some items from gitignore that we no longer have
conform to style guidlines a little better, sorry @duanegearhart
conform to the style even more :(
fix merge conflicts
Merge pull request #58 from mapzen/kk_loki

add tilehierarchy structure