Merge pull request #884 from AndrewGaspar/async

Async with external module support.

async/async.d.ts

@@ -75,4 +75,8 @@ interface Async {
     noConflict(): Async;
 }
 
-declare var async: Async;
+declare var async: Async;
+
+declare module "async" {
+	export = async;
+}

async/asyncamd-tests.ts

@@ -0,0 +1,3 @@
+import async = require("async");
+
+async.map(["a", "b", "c"], (item, cb) => cb(null, [item.toUpperCase()]), (err, results) => { });