[btcsuite/btcd] cea5d3: Prepare for release 0.12.0.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcd
  Commit: cea5d3c1cc16eb07a1686c557db23004655ae11b
      
https://github.com/btcsuite/btcd/commit/cea5d3c1cc16eb07a1686c557db23004655ae11b
  Author: Dave Collins <da...@conformal.com>
  Date:   2015-11-20 (Fri, 20 Nov 2015)

  Changed paths:
    M CHANGES
    M cmd/btcctl/version.go
    M version.go

  Log Message:
  -----------
  Prepare for release 0.12.0.