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

========

https://hg.mozilla.org/integration/gaia-central/rev/224850af6ee0
Author: bmac <bmac325@GMail.com>
Desc: Bug 923438 - [Clock] Refactor button/input interaction

r=jugglinmike

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "66e85edf3cd7f3e5ab8342a823d2a13670437bcd", 
+    "revision": "224850af6ee0082fe5a5b2c893ab1d9c5735c68a", 
     "repo_path": "/integration/gaia-central"
 }