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

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https://hg.mozilla.org/integration/gaia-central/rev/721bbc069f41
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #18467 from KevinGrandon/bug_991261_scroll_to_top

Bug 991261 - [Home2] Method to Return to Top of Vertical Homescreen

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https://hg.mozilla.org/integration/gaia-central/rev/24b48374096f
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 991261 - [Home2] Method to Return to Top of Vertical Homescreen r=me
Bumping manifests a=b2g-bump
backout 3d0d92f2406b for not working properly
Bug 996226 - Disable volatile images everywhere but Android, r=jrmuizel
Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/4919bf19bc3f
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #18459 from eeejay/bug-996284

Bug 996284 - Give lockscreen icons a higher z-index than slider. r=snowmantv

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https://hg.mozilla.org/integration/gaia-central/rev/5454021d9320
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 996284 - Give lockscreen icons a higher z-index than slider.
Bumping manifests a=b2g-bump
Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/3f54f719dc14
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #18359 from huchengtw-moz/gallery/Bug_997051-master

Bug 997051 - [Gallery] the MAX_IMAGE_SIZE in inline viewer doesn't not u...

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https://hg.mozilla.org/integration/gaia-central/rev/3390760fc46a
Author: John Hu <johu@mozilla.com>
Desc: Bug 997051 - [Gallery] the MAX_IMAGE_SIZE in inline viewer doesn't not use customization config value
Bumping manifests a=b2g-bump
Bumping manifests a=b2g-bump
Backed out changeset a6a7df40f00a (bug 997239) for causing regresssions per #devtools
merge mozilla-inbound to mozilla-central
merge fx-team  to mozilla-central
merge b2g-inbound  to mozilla-central
Merge m-c to mozilla-inbound