Reworked recipe to work more like the official popHealth setup guide.

This pull request contains all the changes made in order to make the recipe better follow https://github.com/pophealth/popHealth/wiki/Installation-v2.1 

This also bumps the ruby version up to 1.9.3-p484 since the current one specified in the install guide is now considered insecure.

Note that this removes the install script and moves it into https://github.com/rbclark/popHealth-knife-solo instead.