fix single block response and remove double hex encoding
fix single block response and remove double hex encoding

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