Added tiny refresher icon/css + AutoPanel tweak - refs #24

Added icon and special CSS class 'ra-icon-refresh-tiny' which works the
same as 'ra-icon-magnify-tiny'. This is a useful class to inline within
templates to provide a refresh control (ra-autopanel-reloader).

Also fixed issue in AutoPanel refresher event to prevent bubbling up to
higher AutoPanels if they are nested...