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.

spec/couchrest/core/document_spec.rb

@@ -30,6 +30,9 @@ describe CouchRest::Document do
   end
 
   describe  "default database" do
+    before(:each) do
+      Video.use_database nil
+    end
     it "should be set using use_database on the model" do
       Video.new.database.should be_nil
       Video.use_database @db
@@ -59,9 +62,11 @@ describe CouchRest::Document do
       @doc.rev.should be_nil
       @doc.id.should be_nil
     end
+    
     it "should freak out when saving without a database" do
       lambda{@doc.save}.should raise_error(ArgumentError)
     end
+    
   end
 
   # move to database spec