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

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https://hg.mozilla.org/integration/gaia-central/rev/6c2b33c8f522
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #14487 from cctuan/945553

Bug 945553 - Rewrite install-gaia.py to install-gaia.js

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https://hg.mozilla.org/integration/gaia-central/rev/ffad73493158
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 945553 - Rewrite install-gaia.py to install-gaia.js