add: support side branches
add: support side branches

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