Adjusting test after changing when.d.ts.

Note: In opposite to other Promise implementation such as" promise-es6" or"Q" the implementation "when.js" is AMD/CommonJS aware und therefore needs to be loaded as an module (e.g. using "requirejs").

promises-a-plus/promises-a-plus-tests.ts

@@ -2,7 +2,8 @@
 /// <reference path="../rx.js/rx.async.d.ts"/>
 /// <reference path="../es6-promises/es6-promises.d.ts"/>
 /// <reference path="../q/Q.d.ts"/>
-/// <reference path="../when/when.d.ts"/>
+import When = require("../when/when");
+
 
 var thenNum: PromisesAPlus.Thenable<number>; 
 var thenStr: PromisesAPlus.Thenable<string>;