Fix after rebase

cookbook/helper/HelperFunctions.py

@@ -0,0 +1,13 @@
+from django.db.models import Func
+
+
+class Round(Func):
+    function = 'ROUND'
+    template = '%(function)s(%(expressions)s, 0)'
+
+
+def str2bool(v):
+    if type(v) == bool:
+        return v
+    else:
+        return v.lower() in ("yes", "true", "1")