Updated install instructions
Updated install instructions

- Updated for new OSX installation
- Made txt file markdown compatible.

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