Changes 0.12:
* OpenSSL/crypto/x509.c: Add get_extension_count and get_extension
  to the X509 type, allowing read access to certificate extensions.
* OpenSSL/crypto/x509ext.c: Add get_short_name and get_data to the
  X509Extension type, allowing read access to the contents of an
  extension.
* OpenSSL/ssl/ssl.c: Expose a number of symbolic constants for
  values passed to the connection "info" callback.
* OpenSSL/ssl/connection.py: Add support for new-style
  buffers (primarily memoryviews) to Connection.send and
  Connection.sendall.

(adam)