Feat/1041 (#1045)

* initial changes for stream synonym to listen

* listen on B endpoint if nested listen in dial has channel === 2

lib/tasks/make_task.js

@@ -84,6 +84,7 @@ function makeTask(logger, obj, parent) {
       const TaskTranscribe = require('./transcribe');
       return new TaskTranscribe(logger, data, parent);
     case TaskName.Listen:
+    case TaskName.Stream:
       const TaskListen = require('./listen');
       return new TaskListen(logger, data, parent);
     case TaskName.Redirect: