Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/d8cff16ff54c
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #13697 from zacc/bug_938548

Bug 938548 - Python add test for swiping through apps with edge gestures...

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https://hg.mozilla.org/integration/gaia-central/rev/74e382e9ebe0
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 938548 - Python add test for swiping through apps with edge gestures.