Improve JSON-RPC "method" validation
Improve JSON-RPC "method" validation

jgarzik/pynode,daedalus/python-bitcoin_r,petertodd/tx-flood-attack,petertodd/stealth-addresses-ref-implementation,jgarzik/python-bitcoinlib,daedalus/pynode,robertsdotpm/python-bitcoinlib,petertodd/dust-b-gone