[Merge] lp:~nick-dedekind/qtubuntu/occlusion-2.0 into lp:qtubuntu

[Michael Terry]

I had mentioned getting crashes earlier on IRC.  But I had been using a poorly built version.  Tried again with new build, but still get crashes.

I was toggling between Windowed and Staged modes and got lots of crashes in apps.  Here are some stacktraces with just qtmir/qtubuntu symbols:
They all look roughly like (this one was from gallery-app) http://paste.ubuntu.com/15096134/
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https://code.launchpad.net/~nick-dedekind/qtubuntu/occlusion-2.0/+merge/283194
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