Small fixes, cleanup, and PEP 8
Small fixes, cleanup, and PEP 8

RomanZacharia/pyethapp,d-das/pyethapp,ethereum/pyethapp,kustomzone/pyethapp,heikoheiko/pyethapp,RomanZacharia/pyethapp,danielnovy/test,changwu-tw/pyethapp,gsalgado/pyethapp,gsalgado/pyethapp,vaporry/pyethapp,ethereum/pyethapp,changwu-tw/pyethapp