Bumping gaia.json for 8 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/7b7dbde0b835
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Merge pull request #24566 from Cwiiis/bug1074798-app-grouping-group-dnd

Bug 1074798 - Make creating new groups match spec. r=crdlc,kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/7a57133a3613
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1074798 - Handle injected contextmenu events in grid dragdrop. r=crdlc,kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/11f7767256c0
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1074798 - Add a drop-shadow when dragging a group. r=crdlc,kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/0d7431f392dd
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1074798 - Allow dragging expanded groups. r=crdlc,kgrandon

Collapses groups when you long-press to drag them, as per spec.

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https://hg.mozilla.org/integration/gaia-central/rev/abe2ab93201f
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1074798 - Allow dropping an icon before the first group. r=crdlc,kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/947d6cec14db
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1074798 - Indicate valid drops with group background colour. r=crdlc,kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/6d883efbcdde
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1074798 - Add in-between divider dropping hints. r=crdlc,kgrandon

This simplifies the group rearrangement logic and brings it closer to spec.

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https://hg.mozilla.org/integration/gaia-central/rev/9a19623e2f50
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1074798 - Hide horizontal overflow on the homescreen. r=crdlc,kgrandon
Bumping manifests a=b2g-bump