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/task.js

@@ -42,6 +42,10 @@ class Task extends Emitter {
     return this.cs;
   }
 
+  get summary() {
+    return this.name;
+  }
+
   toJSON() {
     return this.data;
   }