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

========

https://hg.mozilla.org/integration/gaia-central/rev/e1a4a60b9af6
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 926403 - Bump gaiatest version to 0.17. r=dhunt

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "2a2fca16cb4468fbae7f0e7a86eac0cb283cadd1", 
+    "revision": "e1a4a60b9af64df0cdd6d10d8c230d76e1c44f5d", 
     "repo_path": "/integration/gaia-central"
 }