Update travis config
Update travis config

Use their container infrastructure which is much faster to spin up
Cache bundler to speed up build times
Don't install Test Kitchen gems since they're not used
Test on modern ruby releases
Run rubocop and chef spec

ronabop/rundeck,edwlarkey/rundeck,ARentz07/rundeck,ronabop/rundeck,edwlarkey/rundeck,ARentz07/rundeck,edwlarkey/rundeck,ronabop/rundeck,ARentz07/rundeck