Made buttons more button-like, clarified instructions, and added a PGP
signature for the generator (along with instructions on how to validate
the .sig file.)
This removes much of the (albeit excellent) functionality from
bitaddress.org to create a streamined step-by-step paper wallet printer
for novices. Includes a tool to help users "calibrate" their printer
for more consistent output between different browsers. Renamed main
.html file to avoid confusion with bitaddress.org. Moved images into
their own directory since they will be quite large and might not do
well encoded into the JS anymore.
