node: add location method.

lib/node/node.js

@@ -122,6 +122,16 @@ Node.prototype.ensure = function ensure() {
   return this.config.ensure();
 };
 
+/**
+ * Create a file path using `prefix`.
+ * @param {String} file
+ * @returns {String}
+ */
+
+Node.prototype.location = function location(name) {
+  return this.config.location(name);
+};
+
 /**
  * Open node. Bind all events.
  * @private