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

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https://hg.mozilla.org/integration/gaia-central/rev/000cb881b8bd
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #21669 from pivanov/bug-1035713

Bug 1035713 - [Dialer] - Make sure all images are used

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https://hg.mozilla.org/integration/gaia-central/rev/ebb64918a50d
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1035713 - [Dialer] - Make sure all images are used

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https://hg.mozilla.org/integration/gaia-central/rev/0e3aff2e7838
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #21462 from eeejay/bug-1034328

Bug 1034328 - Hide windows when task manager is shown. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/dc8f75222f72
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1034328 - Hide windows when task manager is shown.
Bumping manifests a=b2g-bump