Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/47e7f0831634
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #21500 from etiennesegonzac/bug-1027231

Bug 1027231 - Making sure windows' height are integers in device pixels. r=alive

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https://hg.mozilla.org/integration/gaia-2_0/rev/ecf1a1f94f7c
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #21294 from dominickuo/bug-1009133

Bug 1009133 - [Music] Add hidden style to the player and done icons, r=jimporter
Conflicts:
	shared/test/integration/travis-manifest.json

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https://hg.mozilla.org/integration/gaia-2_0/rev/96fd6dc01611
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #21444 from alivedise/bugzilla/1027401_v2.1/reset-orientation-on-popupclose

Bug 1027401 - Change child event mechanism, r=etienne

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https://hg.mozilla.org/integration/gaia-2_0/rev/5192ba21b7d6
Author: crdlc <crdlc@tid.es>
Desc: Bug 1033531 - [Vertical Homescreen] Apps dont appear in custom smart collections if Smart Collection is entered too quickly

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https://hg.mozilla.org/integration/gaia-2_0/rev/7927cc7ea1f9
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #21296 from 6a68/bug-1032903-erase-all-storages

Bug 1032903 - Erase internal storage if SDcard is default. r=ggp
Bumping manifests a=b2g-bump