Bumping gaia.json for 1 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/565d16505778
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 897437 - SMS message timestamps do not display the expected strings. r=gnarf

Rewrote the message container handling function. Now with lots of unit tests
covering lots of edge cases.

This patch also does a very little bit of safe refactoring, still with unit
tests.