Feature/gather enhancements (#73)

* add bargein support to gather

* bugfix: gather handles interim results from azure

* gather: support for min/max digits and interdigit timeout

* add task summary to some log messages

* logging improvements

lib/tasks/dial.js

@@ -135,6 +135,11 @@ class TaskDial extends Task {
     return !process.env.ANCHOR_MEDIA_ALWAYS && !this.listenTask && !this.transcribeTask;
   }
 
+  get summary() {
+    if (this.target.length === 1) return `${this.name}{type=${this.target[0].type}}`;
+    else return `${this.name}{${this.target.length} targets}`;
+  }
+
   async exec(cs) {
     await super.exec(cs);
     try {