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

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https://hg.mozilla.org/integration/gaia-central/rev/492d71ccf057
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23759 from crdlc/bug-1062527

Bug 1062527 - [Homescreen] Unable to launch apps after changing the date to a previous one

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https://hg.mozilla.org/integration/gaia-central/rev/f12c66a37015
Author: crdlc <crdlc@tid.es>
Desc: Bug 1062527 - [Homescreen] Unable to launch apps after changing the date to a previous one

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https://hg.mozilla.org/integration/gaia-central/rev/196e9c0ff402
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 1064805 - Compress Treeherder attachments. r=rwood
Bumping manifests a=b2g-bump