Updated cmd line tool and gitignore

I added some features and explained how to use the cmd line utility because it wasn't obvious decode was reading from stdin. Also, I think I found and fixed a bug where the onion router's ReplayLog wasn't being started.

command line utility now has a convenient command, new, to generate a new keypair
decode command now starts the in-memory ReplayLog
added README file to explain how to use this utility
gitignore now ignores the binary file cmd/main

Example usage of the new command:

joey@linux $ ./main new
privkey: 9bbc70784a94fbe55cee651b29afcce1db28f144e5f6561f3619babb0dce89bf
pubkey: 020824f6d527ed4d153aeaf21c111056b9f723d25ebcf87bff3a5a0bcf4c9c073c
joey@linux $ ./main generate 020824f6d527ed4d153aeaf21c111056b9f723d25ebcf87bff3a5a0bcf4c9c073c
Node 0 pubkey 020824f6d527ed4d153aeaf21c111056b9f723d25ebcf87bff3a5a0bcf4c9c073c
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

lightningnetwork / lightning-onion

Updated cmd line tool and gitignore #29