Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/51e7f035fcf9
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Bug 1002541 - Bump gaiatest version to 0.23 and release to PyPI

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "ad31807267400551df79a63bc9d77edd9cb32459", 
+    "revision": "51e7f035fcf9f66af1993922da347ff77629a88c", 
     "repo_path": "/integration/gaia-central"
 }