Support rspec-puppet v1.0.0

include_class has been replaced with contain_class.
http://bombasticmonkey.com/2013/12/05/rspec-puppet-1.0.0/
Allow failures from ruby 1.9.3 as it is not yet supported
Merge pull request #45 from ghoneycutt/rspec_puppet_v1

Support rspec-puppet v1.0.0