[conformal/btcutil] 4edc4c: Update for recent btcwire API changes.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcutil
  Commit: 4edc4ceb9ed249e5a8e3aafe8585c52b3acdf21f
      
https://github.com/conformal/btcutil/commit/4edc4ceb9ed249e5a8e3aafe8585c52b3acdf21f
  Author: Dave Collins <da...@conformal.com>
  Date:   2014-01-18 (Sat, 18 Jan 2014)

  Changed paths:
    M block.go
    M block_test.go

  Log Message:
  -----------
  Update for recent btcwire API changes.