Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-2_1/rev/3eded6c57e5c
Author: albertopq <albert.pastor@gmail.com>
Desc: Bug 1121188 - Allowing pointer events on the attention screen chrome

Conflicts:
	apps/system/test/marionette/lib/fakeloopapp.js
	apps/system/test/marionette/lib/utility_tray.js
	apps/system/test/marionette/utility_tray_gestures_test.js

========

https://hg.mozilla.org/integration/gaia-2_1/rev/107835ea479c
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Bug 1116694 - [email/IMAP] moves broken on servers without UIDNEXT support, such as all CoreMail servers (ex: 126.com, 163.com). r=mcav, r=andris9

land https://github.com/mozilla-b2g/gaia-email-libs-and-more/pull/358

========

https://hg.mozilla.org/integration/gaia-2_1/rev/dd7087db20e5
Author: albertopq <albert.pastor@gmail.com>
Desc: Bug 1095677 - Activating utility tray on attention screen

========

https://hg.mozilla.org/integration/gaia-2_1/rev/30777554c433
Author: Jeff Muizelaar <jmuizelaar@mozilla.com>
Desc: Bug 1042241 - Avoid encoding/decoding clip canvas r=kgrandon

We can just paint the one canvas to the other directly. This
avoids the png encoding/decoding time and will reduce peak memory.