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

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https://hg.mozilla.org/integration/gaia-central/rev/388162e9a275
Author: Albert <acperez@tid.es>
Desc: Merge pull request #14697 from acperez/bug-950109

Bug 950109 - Instead of a Music category on landing screen there is a music app. r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/9c01eaee9b5c
Author: Albert <acperez@tid.es>
Desc: Bug 950109 - Instead of a Music category on landing screen there is a music app. r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/1101a065c376
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #14118 from cctuan/943813

Bug 943813 - [Gallery] scrollToShowThumbnail not work

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https://hg.mozilla.org/integration/gaia-central/rev/5c46f7687f6a
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 943813 - [Gallery] scrollToShowThumbnail not work