Fixing issues with dirty tracking on nested models and related improvements

lib/couchrest/model/base.rb

@@ -18,8 +18,8 @@ module CouchRest
       include CouchRest::Model::Associations
       include CouchRest::Model::Validations
       include CouchRest::Model::Designs
-      include CouchRest::Model::Dirty
       include CouchRest::Model::CastedBy
+      include CouchRest::Model::Dirty
 
       def self.subclasses
         @subclasses ||= []
@@ -74,14 +74,6 @@ module CouchRest
         super
       end
 
-      ### instance methods
-
-      # Checks if we're the top document
-      # (overrides base_doc? in casted_by.rb)
-      def base_doc?
-        !@casted_by
-      end
-
       ## Compatibility with ActiveSupport and older frameworks
 
       # Hack so that CouchRest::Document, which descends from Hash,