title: AttributeError: Extension instance has no attribute '__version__'
body: <p>Here is the script..</p>
  
  <pre><code>from distutils.core import setup, Extension
  
  nmap = Extension('nmap',sources = ['nmap/nmap.py', 
                             'nmap/__init__.py', 'nmap/example.py'])
  
  from nmap import *
  
  setup (
      name = 'python-nmap',
      version = nmap.__version__,
      author = 'Alexandre Norman',
      author_email = 'norman@xael.org',
      license ='gpl-3.0.txt',
      keywords="nmap, portscanner, network, sysadmin",)
  </code></pre>
  
  <p>... and i got this error:</p>
  
  <pre><code>Traceback (most recent call last):
    File "C:\Python27\nmap.py", line 6, in &lt;module&gt;
      from nmap import *
    File "C:\Python27\nmap.py", line 17, in &lt;module&gt;
      version = nmap.__version__,
  AttributeError: Extension instance has no attribute '__version__'
  </code></pre>