Remove white spaces.

https://bugzilla.gnome.org/show_bug.cgi?id=733224
Use handle_local_options() for the command-line options.

https://bugzilla.gnome.org/show_bug.cgi?id=733224
Add --mute and --unmute command-line options.

https://bugzilla.gnome.org/show_bug.cgi?id=733224