[conformal/btcwire] 6ad853: use fastsha256

[Marco Peereboom]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcwire
  Commit: 6ad853019a1c2474236ba5abe0bbb12da91c1627
      
https://github.com/conformal/btcwire/commit/6ad853019a1c2474236ba5abe0bbb12da91c1627
  Author: Marco Peereboom <ma...@conformal.com>
  Date:   2013-11-19 (Tue, 19 Nov 2013)

  Changed paths:
    M common.go

  Log Message:
  -----------
  use fastsha256