WIP
Merge branch 'master' of github.com:soundcloud/roshi into walker
Added Keys() to cluster.
Added/fixed tests for Keys().
Skeleton for data walker. Make threshold rates depend on key count.
Data walker completed and tested.
Improve READMEs
roshi-server: implement README
common: implement README
Feedback from Björn
roshi-server: remove dead code
roshi-server: supply explicit quorum; rename flags
.travis.yml: give Redis some time to start
Clarify references to quorum.
RatePolice.
Added instrumentation.
Solved merge conflicts.
Move ratepolice back into the farm package.
Fixed duplication in .travis.yml.
Refactor RatePolice, add KeysThrottled instrumentation.