Bumping gaia.json for 5 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/c88a2ff82b87
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #14587 from sashakruglov/bug_948383

Bug 948383 - Move all `home button event` into GaiaDevice class

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https://hg.mozilla.org/integration/gaia-central/rev/4e670971c297
Author: Sasha Kruglov <sashakruglov@hotmail.com>
Desc: fix functional tests / remove useless imports in endurance tests

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https://hg.mozilla.org/integration/gaia-central/rev/2dcb8b829b59
Author: Sasha Kruglov <sashakruglov@hotmail.com>
Desc: fix for cards_view test

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https://hg.mozilla.org/integration/gaia-central/rev/11637ef3470a
Author: Sasha Kruglov <sashakruglov@hotmail.com>
Desc: call touch_home_button from test code, not from apps

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https://hg.mozilla.org/integration/gaia-central/rev/7d3d2b707686
Author: Sasha Kruglov <sashakruglov@hotmail.com>
Desc: Bug 948383 - Move all `home button event` into GaiaDevice class