add future parser to travis matrix
update rspec-puppet matchers

Convert from #include_class to #contain_class
make #verify_contents usage compatible with rspec-puppet > 1.0.1

The verify_contents method invocations have been updated to work with
rspec-puppet 1.0.1+ but are now incompatible with <= 1.0.1
https://github.com/rodjek/rspec-puppet/issues/235
Merge pull request #1 from jhoblitt/feature/future_parser

Feature/future parser