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

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https://hg.mozilla.org/integration/gaia-central/rev/0adf1112669c
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #15606 from etiennesegonzac/bug-962547-edge-panning-reflows

Bug 962547 - Prevent reflows at the beginning of an edge gesture. r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/91b04438ef0f
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 962547 - Prevent reflows at the beginning of an edge gesture.
r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/5f1853daae5a
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #15629 from askeing/962937

Bug 962937 - Unxfail test_sms_with_attachments.py

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https://hg.mozilla.org/integration/gaia-central/rev/c48ed80c8b63
Author: askeing <askeing@gmail.com>
Desc: Bug 962937 - Unxfail test_sms_with_attachments.py
Bumping manifests a=b2g-bump