Added background-size property for site header for automatically background stretch
Added the $.fn.Loading method to the section 'methods of interest'
Added 'Return type' column to the table 'Methods of Interest'
Added 'jQuery.fn.loading' info to 'Methods of interest'
Added documentation for 'start' option
Added documentation about custom overlay and default themes
Using CDN to load third-party libs and bower for jquery-loading. Fixed wrong tabs on pre codes