Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/1c8f097d092a
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 948580 - [B2G][Email] Send "MAIL FROM" in SMTP probe to validate e-mail address. r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/faae1b491dfe
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Revert "Merge pull request #15951 from mcav/smtp-mail-from"

This reverts commit 7429e25940e2c69582cf850bf99652f37117a3d5, reversing
changes made to 369d6998876b78305a727ecfc4c65ed23792cc10.

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https://hg.mozilla.org/integration/gaia-central/rev/be4b2eb70ddd
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 968852 - Alarm check sign overlays the notification. r=jugglinmike

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https://hg.mozilla.org/integration/gaia-central/rev/ef9a454a542d
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Revert "Merge pull request #16055 from mcav/banner-fade"

This reverts commit 369d6998876b78305a727ecfc4c65ed23792cc10, reversing
changes made to 42278ba0ed95046ab525ede15caec6cdb5c66967.
Bumping manifests a=b2g-bump