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

========

https://hg.mozilla.org/integration/gaia-central/rev/af8197bed0fd
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #15037 from etiennesegonzac/bug-947540-add-contact-fluff

Bug 947540 - Proper role=button on keypad keys. r=rik

========

https://hg.mozilla.org/integration/gaia-central/rev/9a5ae40bed6d
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 947540 - Proper role=key on dialer keypad keys. r=rik