Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_2/rev/761dc42c09c0
Author: vliu <vliu@mozilla.com>
Desc: Bug 1156141 - Make switch from boot animation to first system app screen seamlessly. r=alive

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https://hg.mozilla.org/integration/gaia-2_2/rev/3374d72ede32
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #30611 from RudyLu/keyboard/Bug1114864-igbo_layout_v2.2

Bug 1114864 - merge pull request #29916 from

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https://hg.mozilla.org/integration/gaia-2_2/rev/709a05400adb
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1114864 - merge pull request #29916 from RudyLu:keyboard/Bug1114864-igbo_layout to mozilla-b2g:master

(cherry picked from commit be82b6edc1221f041f282b68570bbe3975b5ffec)

Conflicts:
	apps/keyboard/test/build/integration/keyboard_test.js
	apps/keyboard/test/build/integration/resources/all-layout-make-layouts.json
	apps/keyboard/test/build/integration/resources/default-make-layouts.json
	apps/keyboard/test/build/integration/resources/no-preload-dict-required-make-layouts.json