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

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https://hg.mozilla.org/integration/gaia-central/rev/25a845d52f3e
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #15723 from cctuan/955995

Bug 955995 - Running settings.js on node.js

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https://hg.mozilla.org/integration/gaia-central/rev/218941065148
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 955995 - Running settings.js on node.js
Bumping manifests a=b2g-bump