Update jQuery.

jquery.md

@@ -3,6 +3,16 @@ title: jQuery
 layout: default
 ---
 
+### Traversing
+
+    .children()
+    .closest('div')
+    .filter(':selected')
+    .find('div')
+    .has('div')
+
+    .first()
+
 ### Extending selectors
 
     // $(":inline")

rails-helpers.md

@@ -13,6 +13,7 @@ layout: default
 ### Numbers
 
     number_to_currency 20.33
+    number_to_currency 20.33, precision: 0
     number_with_precision 3.14159, precision: 2
     number_to_percentage 32       #=> "32%"
     number_with_delimiter 2048    #=> "2,048"