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

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https://hg.mozilla.org/integration/gaia-central/rev/fb396d9a75a4
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #13275 from MBRSL/bug-931727-pathfix

bug - 931727 [HW test] update paths in UItest, r=gasolin

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https://hg.mozilla.org/integration/gaia-central/rev/37472e5189c6
Author: Tom Jao <tjao@mozilla.com>
Desc: bug - 931727 [HW test] update paths in UItest

Modify paths according to the change of file structure
Move audio files to data folder

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https://hg.mozilla.org/integration/gaia-central/rev/7ef135be3914
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #13253 from RudyLu/Bug931200-add_croation_keyboard_master

Bug931200 - Add Croation keyboard layout +shepherd.
r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/3e82f59c3c1f
Author: Rudy Lu <me@rudy.lu>
Desc: Bug 931200 - Add Croation keyboard layout +shepherd