Make it possible to put the site in maintenance mode
By specifying the UTC date from which the maintenance shoulds start,
developers can put the site in 'maintenance' mode.
Also redirect to /maintenance if we get a CapabilityDisabledError.
Patch by: Sverre Rabbelier
# Please sort this file in alphabetical order by last (given) name.
# Please only include one name per line. If an (optional) email address is
# included, it must be RFC 2821 compliant (properly quoted, escaped, etc.).
# Lines beginning with # can be stripped from the file, as can blank lines.
"Madhusudan.C.S" <madhusudancs@gmail.com>
"Haoyu Bai" <baihaoyu@gmail.com>
"Augie Fackler" <durin42@gmail.com>
"Mario Ferraro" <fadinlight@gmail.com>
"Todd Larsen" <tlarsen@google.com>
"Chen Lunpeng" <forever.clp@gmail.com>
"Sverre Rabbelier" <sverre@rabbelier.nl>
"Lennard de Rijk" <ljvderijk@gmail.com>
"Pawel Solyga" <pawel.solyga@gmail.com>