BUG: Fix failing cvxopt build in travis (#566)
BUG: Fix failing cvxopt build in travis (#566)

* try conda install of cvxopt

* try specific pip version

cgranade/qutip,anubhavvardhan/qutip,qutip/qutip,anubhavvardhan/qutip,qutip/qutip,cgranade/qutip