Add test for getSenderPublicKey()
Add test for getSenderPublicKey()

ethereumjs/ethereumjs-vm,ethereumjs/ethereumjs-tx,ethereumjs/ethereumjs-vm,michbil/ethereumjs-tx,ethereum/ethereumjs-vm,ethereumjs/ethereumjs-tx,ethereum/ethereumjs-tx,ethereumjs/ethereumjs-vm,ethereumjs/ethereumjs-vm,ethereumjs/ethereumjs-vm