readd: test to assert cpp genesis hash
readd: test to assert cpp genesis hash

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