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

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https://hg.mozilla.org/integration/gaia-central/rev/a1ca162887bf
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #13576 from teodosia/contact-photo-edit

Bug 937068 - Unxfail and enhance wait in test_contact_add_photo

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https://hg.mozilla.org/integration/gaia-central/rev/1b1086a9ecb2
Author: Teodosia Pop <teodosia.pop@gmail.com>
Desc: Bug 937068 - Unxfail and enhance wait in test_contact_add_photo

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "12b5fea8f2d5c1c6044ae26ba98994b2877f34bd", 
+    "revision": "a1ca162887bf2630b0676ebcec04d66010564d7c", 
     "repo_path": "/integration/gaia-central"
 }