[Merge] lp:~jamesh/unity-lens-friends/use-scope-loader into lp:unity-lens-friends

[James Henstridge]

mhr3: I had started on that method originally (as visible in the branch history).

I had difficulty making it work together with the handling of the "like"/"unlike" preview actions, where it responds by asking for a new preview.  I found I couldn't rely on the state in the Unity.ScopeResult on repeated activations, so reverted back to the original preview logic.
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https://code.launchpad.net/~jamesh/unity-lens-friends/use-scope-loader/+merge/173878
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