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

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https://hg.mozilla.org/integration/gaia-central/rev/3c01e0f07370
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #12937 from zacc/bug928376

Bug 928376 - Enable Python lockscreen notification test for Travis

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https://hg.mozilla.org/integration/gaia-central/rev/574f8c8319ee
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 928376 - Enable Python lockscreen notification test for Travis

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https://hg.mozilla.org/integration/gaia-central/rev/4484f0f0eec6
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Merge pull request #12502 from fabi1cazenave/contacts-bug914942

Bug914942:  [Contacts] support Greek and Cyrillic letter separators, r=bkelly

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https://hg.mozilla.org/integration/gaia-central/rev/15cd4a55c272
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: addressing bkelly’s comments

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https://hg.mozilla.org/integration/gaia-central/rev/a35814155ae4
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Bug914942: [Contacts] support Greek and Cyrillic letter separators