added vim swap files to .gitignore
most functions prototyped/modified for wallet recovery
defaulted new parameters in modified functions
compile issues, resolve later.  commiting because switching machines
revert 'dirty hack' change to crypto.h.  need a better way for sure.
missing '.at' on two map calls.  built on some machines, very strange...
builds, but doesn't link.  other than that, electrum-style recovery implemented (but not tested\!)
fixed some pointer- and loop-based derps
more pointer-based derp
stupid signed arithmetic.
DRY cin input_line (and test replacement of non-DRY usage)
reworked command line args for simplewallet.

--generate-new-wallet and --wallet-file are now properly mutually-exclusive.
allow two-random-numbers wallet generation (but not as default)
changed some print messages
changed text a bit more
change hash for keygen from blake to keccak
Merge pull request #28 from tewinget/master

Add electrum-seed wallet backup/recovery