add travis-ci build status icon in the README.md [ci skip]
add travis-ci build status icon in the README.md
[ci skip]

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