Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/b76a48dcfa5a
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #22555 from ArvinH/Bug-1032028

Bug 1032028 - fix jshint error in build/settings.js r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/bd96e6b86003
Author: ArvinH <arvin0731@gmail.com>
Desc: Bug 1032028 - fix jshint error in build/settings.js

remove |node:true| in .jshintrc and remove whitespace on trail of line 200

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https://hg.mozilla.org/integration/gaia-central/rev/73f1f169f6db
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #22549 from ArvinH/fix-jshint-error

Bug 1032041- fix jshint error in build/utils.js

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https://hg.mozilla.org/integration/gaia-central/rev/1e8799c8429c
Author: ArvinH <arvin0731@gmail.com>
Desc: Bug 1032041 - fix jshint error in build/utils.js

remove |node:true| in .jshintrc

fix nits that Yuren mentioned on github

remove unnecessary lines in .jshintignore
Bumping manifests a=b2g-bump