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

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https://hg.mozilla.org/integration/gaia-central/rev/029673339a4b
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #12199 from jrburke/bug915639-email-notify-tests

Bug 915639 email notification tests r=gaye

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https://hg.mozilla.org/integration/gaia-central/rev/5fd4e056555f
Author: jrburke <jrburke@gmail.com>
Desc: Bug 915639 - [Email] Complete integration tests for notifications

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "c9f88878f616a439db6c6be66378af79249f7528", 
+    "revision": "029673339a4bcb9acb87799c7cfe2201049940ee", 
     "repo_path": "/integration/gaia-central"
 }