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

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https://hg.mozilla.org/integration/gaia-central/rev/0f6e26b5cac9
Author: Gregor Wagner <anygregor@gmail.com>
Desc: Merge pull request #14509 from etiennesegonzac/bug-946769-edge-gesture-intermittent

Bug 946769 - Trying to fix the egde gesture marionette test intermittent

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https://hg.mozilla.org/integration/gaia-central/rev/81b96ac56ca3
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 946769 - Trying to fix the egde gesture marionette test intermittent
by properly waiting for the end of the last app-opening transition.