add: finalize and verify blocks
add: finalize and verify blocks

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