[Merge] ~rs2009/unity:master into unity:master

[Marco Trevisan (Treviño)]

I've seen that nemo suports file operations, so please just use it as it should be used,

I've made a branch that adds the NemoFileManager implementation (may need fixes): https://git.launchpad.net/~3v1n0/unity/log/?h=gnome-file-manager-changes
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https://code.launchpad.net/~rs2009/unity/+git/unity/+merge/429299
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