add jruby to allowed_failures list; jruby on travis seems to be having general troubles.
add jruby to allowed_failures list; jruby on travis seems to be having general troubles.

seekingalpha/rollbar-gem,joneslee85/rollbar-gem,ptrln/rollbar-gem,monkbroc/rollbar-gem,rollbar/rollbar-gem,monkbroc/rollbar-gem,heshamnaim/rollbar-gem,fabn/rollbar-gem,rollbar/rollbar-gem,dck/rollbar-gem,redbubble/rollbar-gem,joneslee85/rollbar-gem,crowdworks/rollbar-gem,rollbar/rollbar-gem,ptrln/rollbar-gem,heshamnaim/rollbar-gem,crowdworks/rollbar-gem,seekingalpha/rollbar-gem,heshamnaim/rollbar-gem,redbubble/rollbar-gem,fabn/rollbar-gem,dck/rollbar-gem,dck/rollbar-gem,monkbroc/rollbar-gem,crowdworks/rollbar-gem,seekingalpha/rollbar-gem,joneslee85/rollbar-gem,redbubble/rollbar-gem,ptrln/rollbar-gem,fabn/rollbar-gem