added cython to recommended dependencies. change ipython-notebook to ipython
added cython to recommended dependencies. change ipython-notebook to ipython

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