Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/18329dbbcd17
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1092814 - Disable day_observer_test.js after perma-failing since DST r=kgrandon

========

https://hg.mozilla.org/integration/gaia-central/rev/7b58b054fde2
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1092814 - Disable day_observer_test.js after perma-failing since DST r=kgrandon"

This reverts commit 4ac0fb93e40bd1e65f813eb6f503f976065e9f3c.

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https://hg.mozilla.org/integration/gaia-central/rev/1b1fad7e339f
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1092814 - Disable day_observer_test.js after perma-failing since DST r=kgrandon

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "0fe822928e45d7ddea58cec278a12b831696ce61", 
+    "revision": "18329dbbcd17646f8b354c6a63b0fb7cae205f42", 
     "repo_path": "/integration/gaia-central"
 }