[Merge] lp:~unit193/xfce4-panel/snapshot into lp:ubuntu/xfce4-panel

[Simon Steinbeiß]

I've been testing this panel-snapshot with gtk3-indicators for months now (already used it in Saucy) and I strongly recommend uploading this version. It has been extremely stable and it rids us of the headache we've had with gtk2 indicators.
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https://code.launchpad.net/~unit193/xfce4-panel/snapshot/+merge/206173
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