fixed account_exists
fixed account_exists

ethereum/pyethereum,shahankhatch/pyethereum,ethereum/pyethereum,ddworken/pyethereum,inzem77/pyethereum,ethermarket/pyethereum,karlfloersch/pyethereum,vaporry/pyethereum,harlantwood/pyethereum,shahankhatch/pyethereum,pipermerriam/pyethereum,karlfloersch/pyethereum,ckeenan/pyethereum,pipermerriam/pyethereum,holiman/pyethereum