Linux server

Here's a somewhat cleaned up version of Adi Roiban's Linux server. It's not as smooth as the Mac and Windows ones, since the user is responsible for installing dependencies, but having used it for half a year, I find it quite useful.

I have verified that it works on numerous Linux systems running Gnome, Unity, XFCE and KDE. The latter two require manual installation of `gnome-settings-daemon`.

Note that the readme contains links and references to my repo. You might want to edit those if you merge this in.