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

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https://hg.mozilla.org/integration/gaia-central/rev/3e29b344b532
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #15011 from gasolin/issue-950080-2

Bug 950080 - add grunt jsdoc generator to gaia, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/53cc05de234e
Author: gasolin <gasolin@gmail.com>
Desc: Bug 950080 - add grunt jsdoc generator to gaia