Add Chef.fatal! class method

Spit a fatal log and exit with the given exit code. I'm lazy, sue me.

Author: AJ Christensen

chef/lib/chef.rb

@@ -28,4 +28,11 @@
 
 class Chef
   VERSION = '0.0.1'
+  
+  class << self
+    def fatal!(msg, err = -1)
+      Chef::Log.fatal(msg)
+      exit err
+    end
+  end
 end