TRAVIS: Allow the ruby 2.2.0 and Puppet 3.7.4 builds to fail
TRAVIS: Allow the ruby 2.2.0 and Puppet 3.7.4 builds to fail

Ruby 2.2.0 and Puppet 3.7.4 don't play well together.

edgester/puppet-module-kerberos,michaelweiser/puppet-module-kerberos,DonMaja/puppet-module-kerberos,michaelweiser/puppet-module-kerberos,DonMaja/puppet-module-kerberos,DonMaja/puppet-module-kerberos,edgester/puppet-module-kerberos,edgester/puppet-module-kerberos,michaelweiser/puppet-module-kerberos