add calibrate_line command under alt+t

sumorobot.js

@@ -381,6 +381,9 @@ window.onload = function() {
                 $(".btn-stop").addClass("hover");
                 $(".btn-stop").click();
                 break;
+            case 84: // t
+                sumorobot.send("calibrate_line");
+                break;
             case 87: // w
                 $(".btn-start").addClass("hover");
                 $(".btn-start").click();
@@ -468,6 +471,7 @@ window.onload = function() {
         $("#panel").hide();
     });
 
+    /* load the Mixer stream */
     $("#stream").html('<iframe width="100%" height="100%" allowfullscreen="true" src="https://mixer.com/embed/player/14551694"></iframe>');
 
     /* try to close if block bubble canvas */