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

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https://hg.mozilla.org/integration/gaia-central/rev/9815940f7b86
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #19745 from gasolin/issue-1017435

Bug 1017435 - [window] typo and jshint fix for app_modal_dialog, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/29df5fcf0d65
Author: gasolin <gasolin@gmail.com>
Desc: Bug 1017435 - [window] typo and jshint fix for app_modal_dialog

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https://hg.mozilla.org/integration/gaia-central/rev/0a526002649b
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #19779 from hfiguiere/bug1015427-2

Bug 1015427 - sort the find output for the list of apps. r=eli,yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/4d4012b61435
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 1015427 - sort the find output for the list of apps.
Bumping manifests a=b2g-bump