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

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https://hg.mozilla.org/integration/gaia-central/rev/0e2bf10d1374
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #12867 from bobsilverberg/export_contacts

Bug 927029 - Write a test for exporting contacts to SD Card, r=zac

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https://hg.mozilla.org/integration/gaia-central/rev/f96b2256515a
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Bug 927029 - Write a test for exporting contacts to SD Card, r=zac