Added a favicon (Inspired by The IT Crowd's 'The Internet' bit) and upda...

...ted the YUI menu's example option to be a link to YUI3 specific submenu that should contain any additional YUI3 example pages. Links to new YUI3 example pages should be added to the 'yui_examples.erb' file. Also refactored 'yuimenu.erb' to use the standard page layout template.