Recursion bug fix (#68)

* Fixed bug with cyclic references.

* Fixed jshint issues.

Author: Mark Lagendijk

lib/utils.js

@@ -42,17 +42,20 @@ function waitAllFulfilled (promises) {
 	}));
 }
 
-function createOutputObject (resource) {
-	var assets = _(resource.getChildren())
-		.map(createOutputObject)
-		.uniq()
-		.value();
+function createOutputObject (resource, outputObjectsByUrl) {
+	outputObjectsByUrl = outputObjectsByUrl || {};
 
-	return {
+	var outputObject = {
 		url: resource.getUrl(),
-		filename: resource.getFilename(),
-		assets: assets
+		filename: resource.getFilename()
 	};
+	outputObjectsByUrl[outputObject.url] = outputObject;
+
+	outputObject.assets = _.map(resource.getChildren(), function getOrCreateChildOutputObject (childResource){
+		return outputObjectsByUrl[childResource.getUrl()] || createOutputObject(childResource, outputObjectsByUrl);
+	});
+
+	return outputObject;
 }
 
 module.exports = {