Added systemwide_user.js target
Added systemwide_user.js target

https://github.com/pyllyukko/user.js/pull/363#issuecomment-359502856

pyllyukko/user.js,nodiscc/user.js,Toromtomtom/user.js,nodiscc/user.js,Toromtomtom/user.js,pyllyukko/user.js