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

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https://hg.mozilla.org/integration/gaia-central/rev/544fe010f457
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 943338 - Disable test_cards_view_with_two_apps.py for tbpl-manifest. r=zac

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https://hg.mozilla.org/integration/gaia-central/rev/2ce078ad291d
Author: Sasha Kruglov <sashakruglov@hotmail.com>
Desc: Bug 943338 - Merge test_cards_view_launch tests

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https://hg.mozilla.org/integration/gaia-central/rev/e6ee6dde8512
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 909839 - Merge JavaScript 'atoms' used by gaia and gaiatest. r=jgriffin r=hfiguiere r=zcampbell