explicitly convert the configatron instance to hash when accessing th…

…ings via the old configuration hash

lib/shadow_puppet/manifest.rb

@@ -130,7 +130,7 @@ def self.recipe(*methods)
     # Subclasses of the Manifest class properly inherit the parent classes'
     # configuration.
     def self.configuration
-      configatron
+      configatron.to_hash
     end
 
     # Access to the configuration of the creating class.