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

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https://hg.mozilla.org/integration/gaia-central/rev/fc8241f97254
Author: Evyatar Amitay <evyatron@gmail.com>
Desc: Bug 902517 - The e.me banner is shown above the dock when a bookmark is added. r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/37024c7e63d1
Author: Evyatar Amitay <evyatron@gmail.com>
Desc: Bug 902123 - The background of the landing page is darker once e.me has been opened. r=vingtetun