Switches to use GitUris

src/system/function.ts

@@ -1,6 +1,6 @@
 'use strict';
-// import { debounce as _debounce } from 'lodash';
 const _debounce = require('lodash.debounce');
+const _once = require('lodash.once');
 
 export interface IDeferred {
     cancel(): void;
@@ -11,4 +11,8 @@ export namespace Functions {
     export function debounce<T extends Function>(fn: T, wait?: number, options?: any): T & IDeferred {
         return _debounce(fn, wait, options);
     }
+
+    export function once<T extends Function>(fn: T): T {
+        return _once(fn);
+    };
 }