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

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https://hg.mozilla.org/integration/gaia-central/rev/e696e2775b51
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 1023374 - Use touch events instead of mouse events for the browser app. r=daleharvey

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https://hg.mozilla.org/integration/gaia-central/rev/8f84a9ad810e
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #20384 from mcjimenez/bug1018854

Bug 1018854 - migration after upgrading

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https://hg.mozilla.org/integration/gaia-central/rev/80b13b3313cf
Author: Carmen Jimenez Cabezas <cjc@tid.es>
Desc: Bug 1018854 - Send IAC message when homescreen tutorial starts and fix the migration mechanism
Bumping manifests a=b2g-bump