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

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https://hg.mozilla.org/integration/gaia-central/rev/22491f2a8c4d
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1145543 - merge pull request #29272 from arcturus:bug-1145543 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/31705ff25ef1
Author: Francisco Jordano <fjordano@mozilla.com>
Desc: Bug 1145543 - [RTL][Contacts]The alphabet picker is located on the left side of Gmail, Outlook and Facebook contacts list view r=ferjm

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "a2947cc797061a11eccaa3d7c5aafd7f7358289d", 
+        "git_revision": "a4fc366bc92462f008dea2a1b0ae2f6f039ae10a", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "8c1e1b994ccb03d092c6ce9c386ece5d6b8f8c64", 
+    "revision": "22491f2a8c4d21085ef5f9cbc2f26ad6ce1e78de", 
     "repo_path": "integration/gaia-central"
 }