Updated travis build scripts (from rspec-dev)
Merge pull request #701 from rspec/update-travis-build-scripts-2014-12-26-for-master

Updates from rspec-dev (2014-12-26)
Updated travis build scripts (from rspec-dev)
Attempt to provide documentation for the Minitest exception class
Merge pull request #702 from benmoss/update-travis-build-scripts-2014-12-27-for-master

Updated travis build scripts (from rspec-dev)