[GNU Crypto] new contributions

[Raif S. Naffah]

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hello all,

i'd like to welcome Edward Kmett to the GNU Crypto development team.

Edward already contributed the code for SHA-2 implementations (256-, 
384- and 512-bit).

i've added Edward to the list of AUTHORS, and integrated his 
contribution to the source tree.  it will be included in my next 
checkin.

welcome again Edward + cheers;
rsn
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