Fixed infinite loop on network image load when Url and brokenUrl failed to load

lib/network/Images.js

@@ -7,6 +7,14 @@ function Images() {
   this.callback = undefined;
 }
 
+Images.prototype._resolveRelativeUrl = function(url){
+  var img = document.createElement('img');
+  img.src = url; // set string url
+  url = img.src; // get qualified url
+  img.src = null; // no server request
+  return url;
+}
+
 /**
  * Set an onload callback function. This will be called each time an image
  * is loaded
@@ -52,6 +60,13 @@ Images.prototype.load = function(url, brokenUrl) {
           me.callback(this);
         }
       }
+      else if (this.src === me._resolveRelativeUrl(brokenUrl)){
+        console.error("Could not load brokenImage:", brokenUrl);
+        delete this.src;
+        if (me.callback) {
+          me.callback(this);
+        }          
+      }
       else {
         this.src = brokenUrl;
       }