[zanata/zanata-server] 3bbfb6: chore: use Docker builds for Travis, with caching

[GitHub]

  Branch: refs/heads/travis-docker-cache
  Home:   https://github.com/zanata/zanata-server
  Commit: 3bbfb65940e30c02f72f3bda2e048d697eb54f58
      https://github.com/zanata/zanata-server/commit/3bbfb65940e30c02f72f3bda2e048d697eb54f58
  Author: Sean Flanigan <sflaniga at redhat.com>
  Date:   2015-09-01 (Tue, 01 Sep 2015)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  chore: use Docker builds for Travis, with caching