Added array length feature
Added array length feature

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