Puppet 2.6.x compatibility
Merge pull request #100 from xepa/puppet_2_6_x_compat

Puppet 2.6.x compatibility fix
update travis matrix

- peg the oldest tested version at puppet 2.7.3 + facter 1.6.0,
  primarily to try to catch the class param dangling comma issue that
  effects older versions of puppet
- let the newest version of puppet 3.x free float
Merge pull request #101 from jhoblitt/travis_matrix

update travis matrix