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

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https://hg.mozilla.org/integration/gaia-central/rev/9506ca996d28
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #15604 from KevinGrandon/bug_961112_to_master

Bug 961112 - [Search] Add 'Install' text before Marketplace Title r=daleharvey

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https://hg.mozilla.org/integration/gaia-central/rev/6e16dcdf4541
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 961112 - [Search] Add 'Install' text before Marketplace Title r=daleharvey

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https://hg.mozilla.org/integration/gaia-central/rev/7dff642bdc5a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #15605 from KevinGrandon/bug_960399_to_master

Bug 960399 - Task manager should remain visible when transitioning into search

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https://hg.mozilla.org/integration/gaia-central/rev/f09c0b4c9ea7
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 960399 - Task manager should remain visible when transitioning into search r=alive
Bumping manifests a=b2g-bump