Rework the export-syntax of the mustache-typings

types/mustache/index.d.ts

@@ -243,7 +243,5 @@ declare class MustacheWriter {
  * Provides the functionality to render templates with `{{mustaches}}`.
  */
 declare var Mustache: MustacheStatic;
-
-declare module "mustache" {
-    export = Mustache;
-}
+export = Mustache;
+export as namespace Mustache;

types/node-vault/index.d.ts

@@ -111,7 +111,7 @@ declare namespace NodeVault {
         debug?(...args: any[]): any;
         tv4?(...args: any[]): any;
         commands?: Array<{ method: string, path: string, scheme: any }>;
-        mustache?: MustacheStatic;
+        mustache?: typeof mustache;
         "request-promise"?: any;
         Promise?: PromiseConstructor;