#241 - gather bargein on Nuance has to be based on start of speech event (#246)

lib/tasks/gather.js

@@ -655,6 +655,9 @@ class TaskGather extends Task {
 
   _onStartOfSpeech(cs, ep) {
     this.logger.debug('TaskGather:_onStartOfSpeech');
+    if (this.bargein) {
+      this._killAudio(cs);
+    }
   }
   _onTranscriptionComplete(cs, ep) {
     this.logger.debug('TaskGather:_onTranscriptionComplete');