update .travis.yml to test run both on OS X and Linux
update .travis.yml to test run both on OS X and Linux

natestedman/Result,ratkins/Result,natestedman/Result,ikesyo/Result,NachoSoto/Result,ratkins/Result,ratkins/Result,ikesyo/Result,antitypical/Result,natestedman/Result,antitypical/Result,NachoSoto/Result,antitypical/Result,NachoSoto/Result,ikesyo/Result