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

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https://hg.mozilla.org/integration/gaia-central/rev/5b71834a293a
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #21058 from vingtetun/bug1030675

Bug 1030675 - Handle search app crashes. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/7d0557457b2d
Author: Vivien Nicolas <vnicolas@mozilla.com>
Desc: Bug 1030675 - Handle search app crashes. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/43b1f59b5756
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #21042 from vingtetun/bug1028661

Bug 1028661: Fixed issue [Rocketbar] Overlay of homescreen and searh res...

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https://hg.mozilla.org/integration/gaia-central/rev/4d389aed1953
Author: Camel Aissani <camel.aissani@nuageprive.fr>
Desc: Bug 1028661 - [Rocketbar] Overlay of homescreen and search result view after a cancel search. r=kgrandon
Bumping manifests a=b2g-bump