[btcsuite/btcjson] 316d92: Update Go versions for Travis.

[Josh Rickmar]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcjson
  Commit: 316d92d613a8adfe69a428645774c3b3a974f202
      
https://github.com/btcsuite/btcjson/commit/316d92d613a8adfe69a428645774c3b3a974f202
  Author: Josh Rickmar <jr...@conformal.com>
  Date:   2015-02-06 (Fri, 06 Feb 2015)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Update Go versions for Travis.

Also use Travis' container-based build infrastructure.