thoughtbot/shoulda-matchers — pull request #330 by drapergeek (2013-08-01 18:03:44+00:00)
Title: Specify bundle install for travis.

* Thanks to @sikachu!

Travis will now runs `bundle install --deployment` if it detects that
the project has `Gemfile.lock`. However, there's a problem in Bundler
deployment install that cause it not installing `bundler` gem into
`vendor/bundle` directory, which causes `require 'bundler'` to fail.