Add unregister functions to handlebars.d.ts

handlebars/handlebars.d.ts

@@ -7,6 +7,8 @@
 declare module Handlebars {
     export function registerHelper(name: string, fn: Function, inverse?: boolean): void;
     export function registerPartial(name: string, str: any): void;
+    export function unregisterHelper(name: string): void;
+    export function unregisterPartial(name: string): void;
     export function K(): void;
     export function createFrame(object: any): any;
     export function Exception(message: string): void;