add updates to tilehierarchy and graphid so as to allow loki and graphreader to make use of them
finish up the graph tile from ll method for loki
add some more tests around importance parsing
gracefully handle typos by throwing an exception with a message
Merge pull request #12 from valhalla/kk_loki

graphreader hooks for loki to get tile from ll
GetStreetNameOffset update
Merge branch 'master' of https://github.com/valhalla/baldr into gdg