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

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https://hg.mozilla.org/integration/gaia-central/rev/a76d2ef6040e
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #13293 from stupchiy/issue_931865

Bug 931865 - gaia test is_app_installed doesn't check the last page of apps

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https://hg.mozilla.org/integration/gaia-central/rev/ca5b90284164
Author: Sergey Tupchiy <sergey.tupchiy@optile.de>
Desc: changed logic of is_app_installed, Bug #931865
Bug 933054 - Allow the toJSON identifier to be used in WebIDL interfaces again. r=peterv

--HG--
extra : rebase_source : 83c7724f97d0b2ce709092f2aaf7e15e682c3d90
Bug 930241 - Use toJSON instead of jsonifier in the Contacts interfaces. r=gwagner

--HG--
extra : rebase_source : b19099dec587b7acc3a86e71928423b46b958e0e