chore(es6-promise) rename files/folder to match the npm name

es6-promise/es6-promise-commonjs-tests.ts

@@ -1,4 +1,4 @@
-/// <reference path="es6-promises.d.ts" />
+/// <reference path="es6-promise.d.ts" />
 
 import rsvp = require('es6-promise');
 var Promise = rsvp.Promise;

es6-promise/es6-promise-tests.ts

@@ -1,4 +1,4 @@
-/// <reference path="es6-promises.d.ts" />
+/// <reference path="es6-promise.d.ts" />
 
 
 var promiseString: Promise<string>,