Keys, Router, Campaign updates

More progress towards phase-1. Nothing really _complete_ yet, but general
progress toward a bit of everything.

+ Created a very simple (untested) router (currently does a bunch of
  nothing)
+ Fixed campaign server initialization
+ Setup db-sharding in campaign server
+ Added router rackup config
+ Added basic KeyRange and Key classes for data shards (very, very basic
  at the moment)