Add jQuery Layout 1.3.0 RC

Added latest RC from http://layout.jquery-dev.net/

http://layout.jquery-dev.net/lib/js/jquery.layout-latest.min.js
http://layout.jquery-dev.net/lib/css/layout-default-latest.css

About RC status:

> Despite being a 'release candidate', the 1.3.0 RC version is more bug-free and robust than
> 1.2.0. Plus it has many new options and features.