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

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https://hg.mozilla.org/integration/gaia-central/rev/f962c103562a
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #13570 from timdream/keyboard-settings-back

Bug 914093 - Back button for Gaia Keyboard settings page, r=rudyl

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https://hg.mozilla.org/integration/gaia-central/rev/bdd8d7dea332
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 914093 - Back button for Gaia Keyboard settings page

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "6c4394feb826851f9c54789862edf06ee88364f1", 
+    "revision": "f962c103562a43a7bfe5d0fa4cf05b1c60956b65", 
     "repo_path": "/integration/gaia-central"
 }