generator uses network version 30 (1e) for doge

additionally ups the privkey prefix by 30 from 0x80=>0x9e

updates sig file and attribution in header of generate-wallet.html.
there are only about four lines of actual changes, the rest are
whitespace changes in case you're skeeved out by the number of changes.

this generates functional doge addresses but is still unskinned
update readme, restore bitcoinpaperwallet.com's readme