Adding batch support

lib/google/api_client/discovery/api.rb

@@ -171,6 +171,21 @@ module Google
         end
       end
 
+      ##
+      # Returns the base URI for batch calls to this service.
+      #
+      # @return [Addressable::URI] The base URI that methods are joined to.
+      def batch_path
+        if @discovery_document['batchPath']
+          return @batch_path ||= (
+            self.document_base.join(Addressable::URI.parse('/' +
+                @discovery_document['batchPath']))
+          ).normalize
+        else
+          return nil
+        end
+      end
+
       ##
       # A list of schemas available for this version of the API.
       #