Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/0b7353c4e6d3
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #19751 from evanxd/bug-950673

Bug 950673 - 150+ ms launch regression in gallery, video, camera, email_ftu (Dec 10-13), r=etienne

========

https://hg.mozilla.org/integration/gaia-central/rev/68a70a24c6b1
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 950673 - Delay animationend event until active app loaded.

========

https://hg.mozilla.org/integration/gaia-central/rev/89594e728956
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 1003788 - Update marionette-apps to 0.3.7
Bumping manifests a=b2g-bump