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

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https://hg.mozilla.org/integration/gaia-central/rev/5055c54f21e8
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #17454 from 6a68/bug-949051-fxa-settings-app-resubmitted

Bug 949051 fxa settings app resubmitted

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https://hg.mozilla.org/integration/gaia-central/rev/5dc172d22e1e
Author: Jared Hirsch <ohai@6a68.net>
Desc: Bug 949051 - (Resubmitted) Add Firefox Accounts to Settings app, preffed off. r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/70640c5e270d
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 984238 - Don't kill the keyboard when when it's being launched

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https://hg.mozilla.org/integration/gaia-central/rev/ed3b2a06caea
Author: Eli Perelman <eli@eliperelman.com>
Desc: Converting homescreen swipe animation to be velocity-sensitive

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https://hg.mozilla.org/integration/gaia-central/rev/a7dfef5677bd
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #17442 from bebef1987/fix_settings

Bug 986329 - Fix test_settings_XXX.py with JavascriptException: TypeErro...

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https://hg.mozilla.org/integration/gaia-central/rev/587c86a0396f
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 986329 - Fix test_settings_XXX.py with JavascriptException: TypeError: window.wrappedJSObject.Settings is undefined
Bumping manifests a=b2g-bump