Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-1_2/rev/05fa14983f80
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #13077 from nullaus/v1.2

Merge pull request #12927 from nullaus/bug918143-group-notifications

========

https://hg.mozilla.org/integration/gaia-1_2/rev/4f05a765af97
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #12927 from nullaus/bug918143-group-notifications

bug 918143(cherry picked from commit 163f47b8ca0c6f9cead75347793d8fc39bfefa59)

Conflicts:
	apps/system/test/marionette/lib/notification.js
	apps/system/test/marionette/notification_test.js