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

========

https://hg.mozilla.org/integration/gaia-central/rev/e81a1f281a1d
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1054314 - [GaiaButtons] Default background color should be white r=me

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "e52913fdf478f709cc704871dfe4b1e10173ca8c", 
+    "revision": "e81a1f281a1d3458924bf404fafebf30303e2162", 
     "repo_path": "/integration/gaia-central"
 }