CC-2607: Abilitiy to adjust stream bitrate, type, etc from the UI

interface

- dummy page "Stream Setting" page for the test
- StreamSetting model is added
- set owner and group as 'pypo' for liquidsoap.cfg
- pypofech handle 'update_stream_setting' command

airtime_mvc/public/js/airtime/preferences/streamsetting.js

@@ -0,0 +1,13 @@
+$(document).ready(function() {
+
+    $('#change_setting').click(function(){
+        var url;
+        
+        url = "/Preference/change-stream-setting";
+
+        $.post(url,
+            {format: "json"}
+        );
+    });
+
+});