Feature/queue webhooks (#34)

* initial changes for queue webhooks

* send queue leave webhook when dequeued

* bugfix: if enqeue task is killed because it is being replaced with new app supplied by LCC, ignore any app returned from the actionHook as LCC takes precedence

* remove leftover merge brackets

lib/tasks/dequeue.js

@@ -110,7 +110,8 @@ class TaskDequeue extends Task {
           event: 'dequeue',
           dequeueSipAddress: cs.srf.locals.localSipAddress,
           epUuid: ep.uuid,
-          notifyUrl: getUrl(cs)
+          notifyUrl: getUrl(cs),
+          dequeuer: cs.callInfo.toJSON()
         });
         this.logger.info(`TaskDequeue:_dequeueUrl successfully sent POST to ${url}`);
         bridgeTimer = setTimeout(() => reject(new Error('bridge timeout')), 20000);