code: public List<Article> get(String url) {
  		if(url.equals(KEY_FAVORITES))
  			return getFavorites();
  
  		return articleMap.get(url);
  	}
docs: Looks up the specified URL String from the saved HashMap.
  @param url Safe URL to look up loaded articles from. May also be {@link PkRSS#KEY_FAVORITES}.
  @return A {@link List} containing all loaded articles associated with that
  URL. May be null if no such URL has yet been loaded.