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

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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
Bumping manifests a=b2g-bump