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

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https://hg.mozilla.org/integration/gaia-central/rev/ed107ffac75d
Author: Mike Pennisi <mike@mikepennisi.com>
Desc: Bug 922126 - [Clock] Introduce AMD and associated build process

Using the E-mail application as a guide, formally define Clock's modules
(along with some shared scripts) with the Asynchronous Module Definition
pattern.

r=jrburke