Bumping gaia.json for 3 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/f970557b626a
Author: Rick Waldron <waldron.rick@gmail.com>
Desc: Bug 902973 - REAPPLY Disable sms notification_test.js for frequent TBPL orange, a=test-only

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

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https://hg.mozilla.org/integration/gaia-central/rev/2d0fff56e4df
Author: Sam Joch <samuel@guiora.com>
Desc: Merge pull request #11352 from epang/bug901500_email_missing_images

Bug 901500 - Adding Missing Email Images r=samjoch

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https://hg.mozilla.org/integration/gaia-central/rev/77172567ba5a
Author: Eric Pang <epang@mozilla.com>
Desc: Bug 901500 - Adding Missing Email Images