Fix edge vectors. Was seeing corruption of the Nodes in the map
until started using an allocated vector.
Merge pull request #55 from mapzen/dwn

Fix edge vectors.
Merge pull request #56 from mapzen/kk_loki

Seprate Lua States for Ways vs Nodes Processing, Tile Generation Creates Dirs
Added unit tests for GraphId. Found and fixed issue with less than operator.

                 TestCtorDefault  [PASS]
            TestCtorUintUintUint  [PASS]
                    TestCtorCopy  [PASS]
                  TestGet_tileid  [PASS]
                   TestGet_level  [PASS]
                      TestGet_id  [PASS]
             TestSetUintUintUint  [PASS]
             TestOpPostIncrement  [PASS]
                  TestOpLessThan  [PASS]
                   TestOpEqualTo  [PASS]
Merge branch 'master' of https://github.com/mapzen/valhalla into gdg
Merge pull request #57 from mapzen/gdg

Added unit tests for GraphId. Found and fixed issue with less than operator.
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