Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/e2141418f7b4
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #16190 from cctuan/968690

Bug 968690 - Add Makefile for sms app

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https://hg.mozilla.org/integration/gaia-central/rev/4a581c698d4c
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 968690 - Add Makefile for sms app
Bumping manifests a=b2g-bump