installation script for qutip via homebrew

- This is Py3 as to not avoid conflicts with the built in Python.
- Installs master branch of qutip.
- Shamelessly adapted from the SciPy Superpack.
Remove sudo

The homebrew script makes /usr/local/ directories used writable by the
user, so no need for sudo.
Run unit tests and end

- Run unittests to verify things went ok.
Added py2 version
update py3 version
Point to latest release
Merge pull request #279 from nonhermitian/mac_installation

Homebrew installation scripts