throw exception on N of M multisig
throw exception on N of M multisig

To throw exception on Multisig script and address generation where it
was coded with N of M instead M of N. discussion:
https://github.com/richardkiss/pycoin/commit/08b7c7d4d636f4e0689929e3d68
06467fcc2ab8a#commitcomment-19897678

zsulocal/pycoin,zsulocal/pycoin,mperklin/pycoin,pycoin/pycoin,pycoin/pycoin,shivaenigma/pycoin,richardkiss/pycoin,shivaenigma/pycoin,mperklin/pycoin,richardkiss/pycoin