Chef 11 support for cloudify integration.

New features:
chef-server 11, now supports CentOS/RedHat. Amazon linux support pending due to Opscode bug.
chef-apply - you can now apply arbitrary chef code directly from Cloudify recipes
Berkshelf support - drop a Berksfile in service recipe directory and Cloudify will auto fetch your cookbooks

Changes:
fatBinary is now the default install method.
Default chef version is 11.4.4-1