Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/6aa12aaf3086
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #20826 from justindarc/bug1004721

Bug 1004721 - [Camera] 2.0 Visual Design refresh of top panel viewfinder...

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https://hg.mozilla.org/integration/gaia-central/rev/afaa9871959f
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1004721 - [Camera] 2.0 Visual Design refresh of top panel viewfinder icons

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https://hg.mozilla.org/integration/gaia-central/rev/3fdf810a37e7
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Merge pull request #20885 from Cwiiis/bug1028860

Bug 1028860 - Add animation for adding apps to collections. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/2a52711ddf19
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1028860 - Add animation for adding apps to collections. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/72b1a9ba3e7c
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Merge pull request #20620 from Cwiiis/bug1026180

Bug 1026180 - Activate scrolling at bottom of edit header. r=jlal

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https://hg.mozilla.org/integration/gaia-central/rev/716f7659c6c3
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1026180 - Activate scrolling at bottom of edit header. r=jlal
Bumping manifests a=b2g-bump