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

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https://hg.mozilla.org/integration/gaia-central/rev/b6e214166189
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #14193 from pivanov/bug-944536

Bug 944536 - [Settings] [Followup] 1.3 Visual Refresh of Settings icons

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https://hg.mozilla.org/integration/gaia-central/rev/c965e037f30a
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 944536 - [Settings] [Followup] 1.3 Visual Refresh of Settings icons

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https://hg.mozilla.org/integration/gaia-central/rev/19aaf0b19c79
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #14194 from pivanov/bug-944544

Bug 944544 - [Contacts] Fix alignment of text

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https://hg.mozilla.org/integration/gaia-central/rev/91c330fe4939
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 944544 - [Contacts] Fix alignment of text