PEP8: Fixed few more issues in bloch.py by hand
PEP8: Fixed few more issues in bloch.py by hand

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