Changes license to CC0.
Changes license to CC0.

Same as https://github.com/aurelia/skeleton-navigation/pull/184
aurelia/skeleton-plugin,Vlemert/skeleton-plugin-typescript,genadis/aurelia-mdl,eriklieben/skeleton-plugin-typescript,matthewca/plugin-test,egeland/aurelia-facebook,Vlemert/skeleton-plugin-typescript,Vlemert/skeleton-plugin-typescript,aurelia/skeleton-plugin,egeland/aurelia-facebook,genadis/aurelia-mdl,genadis/skeleton-plugin,genadis/skeleton-plugin,eriklieben/skeleton-plugin-typescript