export named queue creation

addon/lib/namedQueue.js

@@ -0,0 +1,11 @@
+import namedQueue from "named-queue";
+
+export function createNamedQueue(concurrency) {
+  const queue = new namedQueue((task, callback) => task.method()
+      .then(result => callback(false, result))
+      .catch((error => callback(error))), 200);
+  queue.wrap = (id, method) => new Promise(((resolve, reject) => {
+    queue.push({ id, method }, (error, result) => result ? resolve(result) : reject(error));
+  }));
+  return queue;
+}