add: mining
add: mining

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