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

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https://hg.mozilla.org/integration/gaia-2_0/rev/e474dca50b4e
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #22816 from dmarcos/bug1051200

Bug 1051200 - Camera brightness blocked after touch-focusing on dark zon...

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https://hg.mozilla.org/integration/gaia-2_0/rev/5100611f347d
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #22743 from mcav/net-end

Bug 1048487 - [email/backend] node-net.js's end() method does not actual...
Bumping manifests a=b2g-bump