Renamed signRawTransaction in fund_p2sh.go to show it is specifically for signing P2PKH
Created keys.go to generate public/private key pairs for use in P2SH multisig and P2PKH transactions
Added script.go to add Bitcoin Script OP codes as enum for code readability
Implemented M-of-N multsig instead of only 2-of-2 multisig. Tested successfully on mainnet
Added --count flag to keys.go to allow generation of 1 to 100 keypairs with one command
Fixed typo keypair --> key pair
Added --verbose flag to produce concise output when needed from keys.go
Added OP codes to script.go to cover codes used in spend_multisig.go
Added warning for non-standard M-of-N multisig scripts
Updated README