angular : $http timeout can be number or promise

reference : https://github.com/angular/angular.js/issues/1159#issuecomment-19043323

angularjs/angular.d.ts

@@ -580,13 +580,13 @@ declare module ng {
         headers?: any;
 
         cache?: any;
-        timeout?: number;
         withCredentials?: boolean;
 
         // These accept multiple types, so let's defile them as any
         data?: any;
         transformRequest?: any;
         transformResponse?: any;
+        timeout?: any; // number | promise
     }
 
     interface IHttpPromiseCallback<T> {