Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/b3befa3a6a7f
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #15278 from jrburke/bug958675-email-upgrade-alameda

Bug 958675 - [email] Upgrade alameda.js to get latest prim r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/1dd8b2f38bd6
Author: jrburke <jrburke@gmail.com>
Desc: Bug 958675 - [email] Upgrade alameda.js to get latest prim
Bumping manifests a=b2g-bump