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

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https://hg.mozilla.org/integration/gaia-central/rev/252506444017
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #21082 from gaye/bug-1030908-ical.js-build-broken

Bug 1030908 - Upgrade ical.js to v0.0.2 to pick up build fix

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https://hg.mozilla.org/integration/gaia-central/rev/90088f8fc092
Author: gaye <gaye@mozilla.com>
Desc: Bug 1030908 - Upgrade ical.js to v0.0.2 to pick up build fix

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https://hg.mozilla.org/integration/gaia-central/rev/f5b8f493cc52
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #20639 from yglazko/fmd_settings_url

Bug 992929 - URL in FMD device Settings is Incorrect

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https://hg.mozilla.org/integration/gaia-central/rev/4678e3beaec4
Author: yglazko <yglazko@yglazko.local>
Desc: Bug 992929 - Update Find My Device's URL in Settings app r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/3a79611ff5c3
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #21068 from KevinGrandon/bug_1030704_collection_divider

Bug 1030704 - [Collection app] Divider under pinned apps hidden

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https://hg.mozilla.org/integration/gaia-central/rev/b63c80f919c7
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1030704 - [Collection app] Divider under pinned apps hidden r=ranbena

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https://hg.mozilla.org/integration/gaia-central/rev/37f77c63a4ec
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1027112 - [Homescreen] New wallpaper to replace current grass wallpaper r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/0fefd45ced77
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1027112 - [Homescreen] New wallpaper to replace current grass wallpaper r=vingtetun"

This reverts commit 42c35fd8cbf6b2489d0d76c81abfd2d3c6a2d46b.
Bumping manifests a=b2g-bump