[btcsuite/btcd] 979d67: Update for recent TravisCI changes.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcd
  Commit: 979d67627f8bbfba1e2b9777070864f10edab346
      
https://github.com/btcsuite/btcd/commit/979d67627f8bbfba1e2b9777070864f10edab346
  Author: Dave Collins <da...@conformal.com>
  Date:   2015-02-05 (Thu, 05 Feb 2015)

  Changed paths:
    M .travis.yml
    M goclean.sh

  Log Message:
  -----------
  Update for recent TravisCI changes.

Also, override the struct tag checking which is broken in the latest go
vet.