Read and Write Consistency

o Consistency facility for reads and writes.
o Support for KEYS, SCAN, HSCAN, inline PING, QUIT.
o Fixes issues with Dnode request response mismatches.
o Support Cluster_describe command on the stats port to get the cluster topology information.
o Reports Redis per operation counters on the stats port.
o -M flag to set the maximum number of allocated messages in the memory.
o Ability to add data stores beyond redis and memcache via the yml file.
  Note: YML files for Dynomite version  <= 0.4 should be updated to a new
  version to have data_store field.

For Docker

Merge pull request #87 from timiblossom/replication_fix3

Add metrics for latencies