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

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https://hg.mozilla.org/integration/gaia-central/rev/33cee871ed01
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 961642 - [httpd] import registerPrefix from upstream r=yurenju

import changeset from http://hg.mozilla.org/mozilla-central/rev/e840ffbba8d1

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https://hg.mozilla.org/integration/gaia-central/rev/69f07deb7411
Author: Evelyn Eastmond <evhan55@gmail.com>
Desc: Bug 952484 - [Messages][Drafts] We should not show the "replace draft" screen if the user has not changed the draft r=rwaldron
Bumping manifests a=b2g-bump