added metlog-cef and cef to the dependency list for zamboni

requirements/prod.txt

@@ -16,6 +16,8 @@ django-tastypie==0.9.11
 easy-thumbnails==1.1
 gunicorn==0.14.6
 metlog-py==0.9.7
+metlog-cef==0.1
+cef==0.3
 moz_inapp_pay==1.0.2
 oauth2==1.5.211
 PyBrowserID==0.6