update soap definition

soap/soap.d.ts

@@ -3,11 +3,15 @@
 // Definitions by: Nicole Wang <https://github.com/nicoleWjie>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
+/// <reference path='../node/node.d.ts' />
+
 declare module 'soap' {
+    import * as events from 'events';
+
     class WSSecurity {
         constructor(username: string, password: string, options: any);
     }
-    interface Client {
+    interface Client extends events.EventEmitter {
         setSecurity(s: WSSecurity): void;
         [method: string]: (args: any, fn: (err: any, result: any) => void, options?: any) => void;
         addSoapHeader(headJSON: any): void;