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

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https://hg.mozilla.org/integration/gaia-central/rev/13e01795177d
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #12237 from lightsofapollo/bug-916655

Bug 916655 - vbump marionette client (5s element search timeout)

========

https://hg.mozilla.org/integration/gaia-central/rev/a9f87605b70f
Author: James Lal <james@lightsofapollo.com>
Desc: Bug 916655 - vbump marionette client (5s element search timeout)

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "0bd51266be5539df2c24b04eb853c8ebc95f5dc4", 
+    "revision": "13e01795177d901a86ab2c7f211a3333a4bdaa55", 
     "repo_path": "/integration/gaia-central"
 }