added a few more test cases in test_QobjHerm
added a few more test cases in test_QobjHerm

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