cleaned up transaction handling
cleaned up transaction handling

ethers/pyethereum,pipermerriam/pyethereum,ethermarket/pyethereum,ddworken/pyethereum,harlantwood/pyethereum,ethereum/pyethereum,shahankhatch/pyethereum,ethereum/pyethereum,ebuchman/daoist_protocol,ckeenan/pyethereum,ebuchman/daoist_protocol,jnnk/pyethereum,pipermerriam/pyethereum,shahankhatch/pyethereum,karlfloersch/pyethereum,karlfloersch/pyethereum,vaporry/pyethereum,inzem77/pyethereum,holiman/pyethereum