Re-enabled RSS feed generation

It was temporarily turned off while all that refactoring was going on

js/Recipe.js

@@ -315,7 +315,6 @@ Recipe.tiddlerOutputter = {
 
 // Cook an RSS file of the most recent 20 tiddlers
 Recipe.prototype.cookRss = function() {
-	return ""; // Temporarily suppress RSS feed generation
 	var me = this,
 		numRssItems = 20,
 		s = [],