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

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https://hg.mozilla.org/integration/gaia-1_3/rev/a2ce53bd8b38
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #16794 from crdlc/bug-978739

Bug 978739 - After rebooting users are not able to delete/open bookmarks from...

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https://hg.mozilla.org/integration/gaia-1_3/rev/494fae9f3923
Author: Fabien Cazenave <fabien@mozilla.com>
Desc: Merge pull request #16742 from fabi1cazenave/fdnMessages-bug976416

Bug 976416 - [FDN] enable the + sign in the keypad, r=vingtetun
Bumping manifests a=b2g-bump