New knife-convert Knife Plugin

At my last job, I saw the light a while ago and switched from a monolithic Chef repo to individual repositories per cookbook. In addition, I also stopped using roles and started using role cookbooks. Converting my roles to cookbooks wasn’t a huge deal because I mostly used roles as a way of identifying server types and setting a runlist. Most of my roles also didn’t have any attributes specified and I didn’t have a whole lot of roles.