text: Title: Not installing on OS X El Capitan with Python 2.7
  Body: EDIT: The problem below was actually triggered by a binary compatible but different Python(Stackless).
  
  There is currently a problem on OS X.
  Actually, this is a cryptography issue.
  But since I think this package is much more popular,
  it is probably adequate to report the error here.
  
  The cure to this problem is this:
  
  ```
  brew install openssl
  env ARCHFLAGS="-arch x86_64" \
    LDFLAGS="-L/usr/local/opt/openssl/lib" \
    CFLAGS="-I/usr/local/opt/openssl/include" \
      pip install cryptography
  ```
  ## 
  
  
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