Docs for 1.4

["Rohan" <rohan.thale@xxxxxxxxxxxxxxxx>]

Hi Guys,

I'm writing after very long time. I saw post on 1.4 branch. It Look very
promising and interesting. 

I was trying to find out doc of hash based clustering, binary protocol,
storage/bdb etc

Please guide me to get this information.

Your help is really appreciated.

Rohan