Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/ce1a66a53fed
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20798 from KevinGrandon/Cwiiis-bug991460-squashed

Bug 991460 - Allow adding apps to collections in verticalhome.

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https://hg.mozilla.org/integration/gaia-central/rev/219fa13bcceb
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 991460 - Allow adding apps to collections in verticalhome. r=kgrandon

- Make consts in grid_dragdrop upper case.
- Add a 'hovered' class to icons being hovered over in GaiaGrid
- Add a 'collection' class to collections in a GaiaGrid
- Add a larger rearrange delay when hovering over a collection
- Add a pulsing animation to collections when they're hovered over
- Add hook to drop icons into collections
- Add IAC to add apps to collections
Bumping manifests a=b2g-bump