Semi-generic registration mechanism for modules. Still need to clean up references in content_parser

--HG--
branch : pmitros-mod-template

courseware/modules/schematic_module.py

@@ -6,14 +6,15 @@ from mitxmako.shortcuts import render_to_response, render_to_string
 
 from x_module import XModule
 
-class SchematicModule(XModule):
+class Module(XModule):
     id_attribute = 'id'
 
     def get_state(self):
         return json.dumps({ })
 
-    def get_xml_tags():
-        return "schematic"
+    @classmethod
+    def get_xml_tags(c):
+        return ["schematic"]
         
     def get_html(self):
         return '<input type="hidden" class="schematic" name="{item_id}" height="480" width="640">'.format(item_id=self.item_id)