added getTranscriber method and handle new tracks created

JitsiConference.js

     };
     this.isMutedByFocus = false;
     this.reportedAudioSSRCs = {};
+    this.audioRecorder = new AudioRecorder();
 }
 
 /**
     }
 };
 
+/**
+ *
+ */
+JitsiConference.prototype.getTranscriber = function(){
+    if(this.transcriber === undefined){
+        this.transcriber = new Transcriber(this.audioRecorder);
+    }
+    return this.transcriber;
+};
+
 /**
  * Adds JitsiLocalTrack object to the conference.
  * @param track the JitsiLocalTrack object.
     // Add track to JitsiParticipant.
     participant._tracks.push(track);
 
+    // Add track to the audioRecorder
+    this.audioRecorder.addTrack(track);
+
     var emitter = this.eventEmitter;
     track.addEventListener(
         JitsiTrackEvents.TRACK_MUTE_CHANGED,

JitsiConferenceEventManager.js

 
                         conference.eventEmitter.emit(
                             JitsiConferenceEvents.TRACK_REMOVED, track);
+                        
+                        conference.audioRecorder.removeTrack(track);
+                        
                         return;
                     }
                 }