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

========

https://hg.mozilla.org/integration/gaia-1_4/rev/ad4811b4d27c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 960126 - Disable intermittent test on travis, Notification.get(): should work across domains
Bumping manifests a=b2g-bump