[Merge] lp:~kgunn72/ubuntu-touch-session/enable-overlays into lp:ubuntu-touch-session

[Kevin DuBois]

Review: Approve

looks good to me although:
1) shouldn't land until mir/devel rev 1897 lands 
and
2) I'm going to change the default in mir soon, so we might have to reverse this in the near future
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https://code.launchpad.net/~kgunn72/ubuntu-touch-session/enable-overlays/+merge/233817
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