ClusterManager client can try to set service member down
ConsistencyRecovery cleanup
Improved consistency state management
Cleaner consistency validation
Reuse consistency error exception  as intended
Merge branch 'master' into manu-consistency-state

Conflicts:
	nrv-core/src/main/scala/com/wajam/nrv/consistency/ConsistencyMasterSlave.scala
Removed misleading copy/paste comment
Merge pull request #124 from wajam/manu-consistency-state

Improved consistency state management