title: ValueError with 'ciphers' when importing paramiko
body: <p>I want to install paramiko on win 7 32bit ,the python is 3.3 .
  I can compile it，but get follow errors:</p>
  
  <pre><code>Installed c:\python33\lib\site-packages\paramiko-1.8.0-py3.3.egg
  Processing dependencies for paramiko==1.8.0
  Searching for pycrypto==2.6
  Best match: pycrypto 2.6
  Adding pycrypto 2.6 to easy-install.pth file
  
  Using c:\python33\lib\site-packages
  Finished processing dependencies for paramiko==1.8.0
  
  C:\Users\MC\Downloads\paramiko-paramiko-v1.8.0-9-g786920a&gt;python
  Python 3.3.0 (v3.3.0:bd8afb90ebf2, Sep 29 2012, 10:55:48) [MSC v.1600 32 bit (Intel)] on win32
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import paramiko
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
    File ".\paramiko\__init__.py", line 62, in &lt;module&gt;
      from .transport import SecurityOptions, Transport
    File ".\paramiko\transport.py", line 68, in &lt;module&gt;
      class SecurityOptions (object):
  ValueError: 'ciphers' in __slots__ conflicts with class variable
  &gt;&gt;&gt;
  </code></pre>