[Cryptography Team] Plugin update

[Levente Uzonyi]

Hi!

I've created an SHA-256 plugin (just for fun :), and updated the MD5.  
Both should work on little and big endian machines. The source package  
and precompiled modules for win32 are available here:  
http://leves.web.elte.hu/cryptography/
The code is available under the MIT license.

Cheers,
Levente