Support Puppet v4

[ghoneycutt]

Modernize module

• Drop support for Puppet v2.

• Add support for Puppet v4.

• Explicitly test against supported Ruby and Puppet matrix.

• Support Ruby versions 1.8.7, 1.9.3, 2.0.0, 2.1.0 and 2.3.1.

• Use puppet-lint v2.

• Use community puppet-lint plugins (Code already complied with the
  style).

[ghoneycutt]

Hi @thias could you please merge this

[snahelou]

Hello

Great job, I need this feature too :)

Regards

[Phil-Friderici]

Hej @thias,
We are using a setup like @ghoneycutt proposed since years and it helps us a lot.
It will create tests in all combinations of Puppet & Ruby, here is an example: https://travis-ci.org/Phil-Friderici/puppet-module-afs/builds/203724249

Please give it a try :)

[Phil-Friderici]

If you are interessted in this, I can add the needed changes to keep this running with the latest Puppets and gem versions.

[ghoneycutt]

@Phil-Friderici I would be happy to accept those in my branch if you would like to submit a PR against that.

[Phil-Friderici]

@ghoneycutt sent a PR to your branch

@thias my repo has Travis CI enabled and you can have a peek how a PR will looks like with it [1] and what nice overview you get about the tested combinations of Puppet and Ruby [2].

[1] Phil-Friderici#1
[2] https://travis-ci.org/Phil-Friderici/puppet-sysctl/builds/221247268