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

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https://hg.mozilla.org/integration/gaia-central/rev/e616977e398b
Author: crdlc <crdlc@tid.es>
Desc: Bug 1016327 - [Vertical Homescreen] Home button is broken r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/fc5190b28af4
Author: AndreiH <andrei.hutusoru@softvision.ro>
Desc: Merge pull request #19548 from chirarobert/xfail_skip_tour

Bug 1014574 - Xfail test_ftu_skip_tour.py with Bug 1013920 and Bug 10138...

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https://hg.mozilla.org/integration/gaia-central/rev/ddcbd03d5593
Author: chirarobert <robert.chira@softvision.ro>
Desc: Bug 1014574 - Xfail test_ftu_skip_tour.py with Bug 1013920 and Bug 1013859
Bumping manifests a=b2g-bump