records hiscore to localStorage, and displays it [fixes #3]
rejigged code and added sections
added missing semicolons
removed custom bind, it's only called once, so there's no need to have it as a bind
speeds up by 5px/frame every 10s (which is an acceleration of, I think, 0.5px/frame/s) [fixes #2]
now one can click to jump as well as use the keyboard