add url-join node module.

package.json

@@ -39,6 +39,7 @@
     "osenv": "^0.1.3",
     "read": "^1.0.7",
     "tmp": "0.0.27",
+    "url-join": "0.0.1",
     "vso-node-api": "^0.4.2",
     "yazl": "^2.2.2"
   },

typings/url-join/url-join.d.ts

@@ -0,0 +1,5 @@
+declare module 'url-join' {
+	function join(...args: string[]): string;
+	
+	export = join;
+}