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

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https://hg.mozilla.org/integration/gaia-central/rev/048c50ecdf54
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20815 from KevinGrandon/bug_1028311_collection_update_init_pinned_structure

Bug 1028311 - Update initial structure for pinned results in collections

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https://hg.mozilla.org/integration/gaia-central/rev/12a3c0bf9920
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1028311 - Update initial structure for pinned results in collections r=lightsofapollo

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https://hg.mozilla.org/integration/gaia-central/rev/bc30e2b4d6bc
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20808 from KevinGrandon/bug_1028087_collection_population_from_apps

Bug 1028087 - [Collection] Population task for app install/uninstall

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https://hg.mozilla.org/integration/gaia-central/rev/7355f686ea55
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1028087 - [Collection] Population task for app install/uninstall r=kgrandon
Bumping manifests a=b2g-bump