add: initialize blockchain; adding blocks; removed: block_score persistence (let's optimize later)
add: initialize blockchain; adding blocks; removed: block_score persistence (let's optimize later)

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