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

========

https://hg.mozilla.org/integration/gaia-central/rev/ae9f47131446
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #12931 from AlinT/improve_import_sim

Bug 927886 - Impprove test_import_contacts_from_SIM

========

https://hg.mozilla.org/integration/gaia-central/rev/d8363356ad92
Author: AlinT <trifandreialin@gmail.com>
Desc: Bug 927886 - Impprove test_import_contacts_from_SIM

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "9d1930d6b33ce6b4137820bba8fb48c8a60baa61", 
+    "revision": "ae9f47131446dca66326715c1fd408e61127027c", 
     "repo_path": "/integration/gaia-central"
 }