fetch binding

Author: guybedford

lib/system.js

@@ -203,8 +203,9 @@
       return toAbsoluteURL(this.baseURL, outPath);
     },
     fetch: function(load) {
+      var self = this;
       return new Promise(function(resolve, reject) {
-        fetchTextFromURL(toAbsoluteURL(this.baseURL, load.address), function(source) {
+        fetchTextFromURL(toAbsoluteURL(self.baseURL, load.address), function(source) {
           resolve(source);
         }, reject);
       });