should run in travis ci

**Force Pushed**  Fri Jul 25 14:00

## motivation

I am about to start pushing changes to implement Xcode 6 + Yosemite compatibility.  I need tests to ensure that I don't break backward compatibility.  I would like these tests be run against the ruby versions we support.  Travis CI is good fit testing backward compatibility because it is running Xcode 5.1 + Mavericks + rvm.

This PR wires up run_loop to travis-ci.  The current test is simple; it just tries to install the gem.

My plan is to implement the run_loop tests in rspec.

**note** I disabled travis-ci email notifications.  There are options for passing notifications to IRC, HipChat, and Slack.  I would prefer not to receive email notifications.

## todo

- [ ] @krukow needs review

## tests

Already run. :)