Drop Chef 11 support

[majormoses]

With chef 13 being released and all the chef community cookbooks somewhat recently dropped chef < 12.1 support I think it's time to rip the bandaid off and do a major release. Yes I am sure that quite a few people will complain but we must think what is best for the community. They will still be able to use it in it's existing form by pinning to 1.x but those with newer chef setups can benefit from newer features. We should add a section for this in the readme.

[majormoses]

@duchatran @zl4bv I am planning to do some more repo cleanup and add testing to travis. From my stance all non patch contributions should probably go on hold for a bit (PRs already opened should be evaluated) while we stabilize the repo and prepare for the major version bump. We will probably want to do a minor version release prior to get everyone on chef 11 a last round of goodies before they are left behind from a feature development stance.

[majormoses]

Chef 14 is the newest major releases. We should drop chef chef < 12.14 but we could do it in phases if that is better if thats what we decide.