Replaced onload and onclick handlers with jQuery ready and click
methods.
Attempted to jQuerify the DOM construction a little.
First attempt at adding a popover containing an input item with the
bookmarklet text in.  This is to try and make it possible to create a
bookmarklet on an iPad/iPod/iPhone etc.  Also tidies the text at the
bottom of the page slightly.
Padded out README.md slightly.