updates to develop branch
updates to develop branch

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