Enable OSX testing on Travis CI.
Enable OSX testing on Travis CI.

kbrock/chruby,ilikepi/chruby,regularfry/chruby,postmodern/chruby,ilikepi/chruby,eunomie/chgo,postmodern/chruby,ngpestelos/chruby,ngpestelos/chruby,eunomie/chgo,kbrock/chruby,regularfry/chruby