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

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https://hg.mozilla.org/integration/gaia-central/rev/3729e5ab196a
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #13606 from AndreiH/bug937522

Bug 937522 - Xfali test_export_contacts_to_sdcard

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https://hg.mozilla.org/integration/gaia-central/rev/65bd52cdd896
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 937522 - Xfali test_export_contacts_to_sdcard