Started on the ExtendedDocument class with features moved to mixins.

Properties got added, they define getters, setters and aliases.
They will also be the base of the new validation system.

lib/couchrest/mixins/document_queries.rb

@@ -35,6 +35,12 @@ module CouchRest
           first_instance.empty? ? nil : first_instance.first
         end
         
+        # Load a document from the database by id
+        def get(id)
+          doc = database.get id
+          new(doc)
+        end
+        
       end
       
     end