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

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https://hg.mozilla.org/integration/gaia-central/rev/a7eca2fffd83
Author: Rick Waldron <waldron.rick@gmail.com>
Desc: Bug 957714 - [Messages] Interacting with message field prevents recipients field from stealing focus (cursor jump) r=julienw

https://bugzilla.mozilla.org/show_bug.cgi?id=957714
Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

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https://hg.mozilla.org/integration/gaia-central/rev/d9127dcf6f00
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #15815 from davidflanagan/bug956811

Bug 956811: ugly workaround that abuses the settings db for interapp communication r=jporter

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https://hg.mozilla.org/integration/gaia-central/rev/95e6a1054835
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 956811: ugly workaround that abuses the settings db for interapp communication
Bumping manifests a=b2g-bump