fix generic cover path
browser reading for cbx and epub files no longer creates temp files on server
browser reading for cbx and epub files working (#502, #520)
-Added Current page indicator to the thumbnail list, as well as a hover state
-Thumbnail list now scrolls to the current page on open or page change
-Added @andy29485's request for controlling page with space/shift+space
-Added the book title to the top of the page -Fixed IE11 failing on imagecallback