Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/e94b1d1ba5d1
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #11582 from wanderview/makefile-app-test

Bug 906184: Fix APP= when running tests for nested apps.  r=fabrice

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https://hg.mozilla.org/integration/gaia-central/rev/79c14638fbdc
Author: Ben Kelly <ben@wanderview.com>
Desc: Bug 906184: Fix APP= when running tests for nested apps.