adding the ability to have multiple api hosts
adding walk util
simpler logic + micro optimization
pulling in BB router, rather than duplicating logic. as noted on PR #45
adding tests for apiHosts feature
adding fixtures for util.walk tests
pulling util.walk tests, contextual dir dependency is touchy + solidifying utils require
util.walk test back in

- sorry for the noise on this
pulling 'walk' method from utils
A cleaner way of supporting multiple API hosts
Removing test of deleted code
Merge pull request #52 from airbnb/multiple-api-hosts

Multiple api hosts, part 2