title: pyusb on macOSX 10.11 step by step
body: <p>Can anybody take my hand and guides me through installation of pyusb on my Mac, step by step ?
  I have a fresh installed osx 10.11.6 (which comes already with python).
  What I tried until now (nothing more, nothing less) is to install latest version of pyusb (v1.0.0) and stucked like this</p>
  
  <pre><code>xxx-MB:~ xxx$ sudo /Users/xxx/Downloads/pyusb-1.0.0/setup.py install
  running install
  running build
  running build_py
  error: package directory 'usb' does not exist
  </code></pre>
  
  <p>Thanks for help.</p>