Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/a5899fda04e5
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #20604 from pivanov/bug-1026414

Bug 1026414 - [Flame][Settings] - Fuzzy keyboard icons

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https://hg.mozilla.org/integration/gaia-central/rev/2e733442c290
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1026414 - [Flame][Settings] - Fuzzy keyboard icons

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https://hg.mozilla.org/integration/gaia-central/rev/7c4453ee1a81
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #20282 from pivanov/bug-1023146

Bug 1023146 - [Flame][Settings] - Wifi image update

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https://hg.mozilla.org/integration/gaia-central/rev/e857e9d86259
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1023146 - [Flame][Settings] - Wifi image update
Bumping manifests a=b2g-bump