try for newer sklearn on trvis, add cvxopt
try for newer sklearn on trvis, add cvxopt

amueller/pystruct,d-mittal/pystruct,pystruct/pystruct,massmutual/pystruct,massmutual/pystruct,amueller/pystruct,wattlebird/pystruct,d-mittal/pystruct,wattlebird/pystruct,pystruct/pystruct