jQuery ES6 partial refactoring

Prefix jQuery variables with $
Start avoiding jQuery in easy cases
Use let/const

app/views/helpers/javascript_vars.phtml

@@ -42,7 +42,7 @@ echo htmlspecialchars(json_encode(array(
 		'reading_view' => @$s['reading_view'],
 		'rss_view' => @$s['rss_view'],
 	),
-	'url' => array(
+	'urls' => array(
 		'index' => _url('index', 'index'),
 		'login' => Minz_Url::display(array('c' => 'auth', 'a' => 'login'), 'php'),
 		'logout' => Minz_Url::display(array('c' => 'auth', 'a' => 'logout'), 'php'),