example update

This version introduces multiple enhancements:

example moved to example directory
also splited to common footer and header

Details of additions/deletions below:
--------------------------------------------------------------

Added:      examples/header.php
            -- Added --
                common header

Added:      examples/footer.php
            -- Added --
                common footer

Modified:   examples/index.php
            -- Added --
                footer and header

Modified:   skin/core/default/css/base.css
            -- Updated --
                added main block style

Removed:   examples.php