Escape `notify-send` arguments.
Escape `notify-send` arguments.

I have no idea how to write a failing spec, because escaping
happens within `system` when you provide each argument
as parameter.

system([env,] command... [,options]) → true, false or nil

(Fixes #443)

kaldrenon/notiffany,guard/notiffany,railsme/notiffany,kaosf/notiffany