changed error page, MASSIVE new sound extension added with working YouTube duration, preparation and streaming API steps, wsgi random comment removal

app/simple_routes.py

@@ -24,4 +24,4 @@ def unauthorized(e):
 @app.errorhandler(404)
 def page_not_found(e):
     # note that we set the 404 status explicitly
-    return render_template('404.html'), 404
+    return render_template('error.html', code=404, message='Content not found...'), 404