Updating travis.yml to test multiple ruby versions
Updating travis.yml to test multiple ruby versions

I am adding the multiple ruby version tests to lita-hipchat as well.

crimsonknave/lita-hipchat,jimmycuadra/lita-hipchat,litaio/lita-hipchat,sadfuzzy/lita-xmpp,onewheelskyward/lita-hipchat,lazyfrosch/lita-xmpp