travis: enable testing against new puppet releases
travis: enable testing against new puppet releases

rbramwell/rspec-puppet,jeremy-asher/rspec-puppet,puppetlabs/rspec-puppet,fitpay/rspec-puppet,tuxmea/rspec-puppet,iankronquist/rspec-puppet,glauco/rspec-puppet,johnmccabe/rspec-puppet,electrical/rspec-puppet,DavidS/rspec-puppet,rodjek/rspec-puppet