Import release 0.1.3

[secnet] / CREDITS

Stephen Early <steve@greenend.org.uk> - original author
Ross Anderson, Eli Biham, Lars Knudsen - serpent
Colin Plumb, Ian Jackson - MD5 implementation
Steve Reid <sreid@sea-to-sky.net>, James H. Brown <jbrown@burgoyne.com> - 
  SHA1 implementation
Cendio Systems AB - ipaddr.py