* Introduced fab!, a helper that creates database state for a group
It's almost identical to let_it_be, except:
1. It creates a new object for each test by default,
2. You can disable it using PREFABRICATION=0
Attempt to force NGINX to include content length when doing X-SendFile
This does not seem to be required when bypassing NGINX.
Without this header some CDNs may have issues caching
