Added priv_to_wif and wif_to_priv commands
Added priv_to_wif and wif_to_priv commands

conio/pybitcointools,prasos/pybitcointools,wizardofozzie/pybitcointools,stamhe/pybitcointools,fcracker79/pybitcointools,kangasbros/pybitcointools,christianlundkvist/pybitcointools,CoinBlack/pyblackcointools