Merge pull request #51 from calcu16/master

Lowering log levels
Adding comments to clarify cleaner policy in DarkCanaryChannelHandler.

The cleaner policy ensures that that Request objects are dropped from
the ClientChannelHandler.requestMap before they are dropped from
the DarkCanaryChannelHandler.requestMap, ensuring that dark responses
are never propagated upstream. This commit clarifies how this works.
Bump version
Merge pull request #52 from linkedin/dark-canary-fixes

Dark canary code patches
Fixing comments in PartitionedNetworkClient.
Only printing expired message if there are expired entries