Fix wrong GROUP_BY on performance stats (bug 1010728)
Rename storage to user-media (bug 1013865)

We noticed that /storage/ path conflicts with some other
URL configuration on the servers.
Merge pull request #177 from yohanboniface/bug-1013865-staticfiles-fixes

Rename storage to user-media (bug 1013865)
Bug 837894: Fix stats labels for native Fennec.
Merge pull request #173 from yohanboniface/bug-1010728-performance-stats

Fix wrong GROUP_BY on performance stats (bug 1010728)