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

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https://hg.mozilla.org/integration/gaia-central/rev/390883ae9bd6
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #17767 from dmarcos/bug989283

Bug 989283 - [Camera] [Madai] Indicators are difficult to see on dark ba...

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https://hg.mozilla.org/integration/gaia-central/rev/3becdcbec999
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 989283 - [Camera] [Madai] Indicators are difficult to see on dark background

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https://hg.mozilla.org/integration/gaia-central/rev/9b3e5f129c94
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #17640 from crh0716/983080

Bug 983080 - Add 2.25x icons to settings app r=evelyn

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https://hg.mozilla.org/integration/gaia-central/rev/ddf92f61c5c6
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 983080 - Add 2.25x icons to settings app

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https://hg.mozilla.org/integration/gaia-central/rev/93d3a1ad43a6
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #17358 from crh0716/981510

Bug 981510 - Define MVVM as AMD modules r=evelyn

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https://hg.mozilla.org/integration/gaia-central/rev/2618dfc5d501
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 981510 - Define MVVM as AMD modules
Bumping manifests a=b2g-bump