fix: update playlist changes in local store

Move playlist change logic out of the library while we're at it and notify
the library of changes instead.

fixes #302

src/main.rs

@@ -17,7 +17,6 @@ extern crate tokio_timer;
 extern crate unicode_width;
 extern crate webbrowser;
 
-
 #[macro_use]
 extern crate serde;
 extern crate serde_json;