simplewallet: prompt for private keys when generating wallets
simplewallet: prompt for private keys when generating wallets

instead of supplying them on the command line. It's more
unwieldy, but better protects against information leaks.

eiabea/bitmonero,eiabea/bitmonero,eiabea/bitmonero,ranok/bitmonero,ranok/bitmonero,ranok/bitmonero,eiabea/bitmonero,eiabea/bitmonero,eiabea/bitmonero,ranok/bitmonero,ranok/bitmonero,ranok/bitmonero