Switch template definitions to yaml, so that they can have multiline strings

common/lib/xmodule/xmodule/capa_module.py

@@ -644,6 +644,8 @@ class CapaDescriptor(RawDescriptor):
     # actually use type and points?
     metadata_attributes = RawDescriptor.metadata_attributes + ('type', 'points')
 
+    template_dir_name = 'problem'
+
     # VS[compat]
     # TODO (cpennington): Delete this method once all fall 2012 course are being
     # edited in the cms

common/lib/xmodule/xmodule/templates/default/empty.json

-{
-    "metadata": { "display_name": "Empty" },
-    "data": "",
-    "children": []
-}

common/lib/xmodule/xmodule/templates/default/empty.yaml

+---
+metadata:
+    display_name: Empty
+data: ""
+children: []

common/lib/xmodule/xmodule/templates/problem/multiline.yaml

+---
+metadata:
+    display_name: Multiline XML
+data: |
+    <problem>
+    </problem>
+children: []

common/lib/xmodule/xmodule/x_module.py

 import logging
 import pkg_resources
-import json
+import yaml
 import os
 
 from functools import partial
@@ -352,7 +352,7 @@ class ResourceTemplates(object):
 
         for template_file in resource_listdir(__name__, dirname):
             template_content = resource_string(__name__, os.path.join(dirname, template_file))
-            template = json.loads(template_content)
+            template = yaml.load(template_content)
             templates.append(Template(**template))
 
         return templates