[conformal/btcd] 476000: Implement getnetworkhashps RPC.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcd
  Commit: 476000193f180242be75235d7160e1791c09f014
      
https://github.com/conformal/btcd/commit/476000193f180242be75235d7160e1791c09f014
  Author: Dave Collins <da...@conformal.com>
  Date:   2014-02-07 (Fri, 07 Feb 2014)

  Changed paths:
    M rpcserver.go
    M util/btcctl/btcctl.go

  Log Message:
  -----------
  Implement getnetworkhashps RPC.

Closes #87.