[conformal/btcrpcclient] d3d561: Update TravisCI to goclean script.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcrpcclient
  Commit: d3d5618ef92a1649a2c3fd88de32d6efd3ac022b
      
https://github.com/conformal/btcrpcclient/commit/d3d5618ef92a1649a2c3fd88de32d6efd3ac022b
  Author: Dave Collins <da...@conformal.com>
  Date:   2015-01-15 (Thu, 15 Jan 2015)

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

  Log Message:
  -----------
  Update TravisCI to goclean script.

Also update to use the new container-based builds

For now, golint has been disabled since it fails due to wanting
HTTPPostMode.  This change will be made as a part of the upgrade to use
btcjson2 since it involves an API change.