[conformal/btcwallet] 8759d1: allow client to disconnect when handlers are done

[Javed Khan]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcwallet
  Commit: 8759d12617c5f891dc928939a7b0e70a9d21523b
      
https://github.com/conformal/btcwallet/commit/8759d12617c5f891dc928939a7b0e70a9d21523b
  Author: Javed Khan <tuxcan...@gmail.com>
  Date:   2014-08-08 (Fri, 08 Aug 2014)

  Changed paths:
    M rpcserver.go

  Log Message:
  -----------
  allow client to disconnect when handlers are done

added a waitgroup on websocketClient to keep track of handler
goroutines specific to the client