add statsd timing middleware

settings.py

@@ -243,6 +243,7 @@ def JINJA_CONFIG():
 MIDDLEWARE_CLASSES = (
     # AMO URL middleware comes first so everyone else sees nice URLs.
     'amo.middleware.TimingMiddleware',
+    'commonware.response.middleware.GraphiteRequestTimingMiddleware',
     'amo.middleware.GraphiteMiddleware',
     'amo.middleware.LocaleAndAppURLMiddleware',
     # Mobile detection should happen in Zeus.