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

========

https://hg.mozilla.org/integration/gaia-central/rev/d1e81b32a9e2
Author: lissyx <lissyx+github@lissyx.dyndns.org>
Desc: Merge pull request #13691 from lissyx/bug929895

Bug 929895 - Blacklist some apps of notifications removal r=alive

========

https://hg.mozilla.org/integration/gaia-central/rev/0e5f3265ad40
Author: Alexandre Lissy <lissyx+github@lissyx.dyndns.org>
Desc: Bug 929895 - Blacklist some apps of notifications removal

Until bug 890440 is addressed, the system app clears all notifications
related to an application when it is launched/displayed. This is not
what we want for a couple of applications. We add a temporary hack to
blacklist those, thus avoiding to clear notifications.