Add X13/14/15 SHA3 algos (hamsi,fugue,shabal,whirlpool)

Tested on HashHarder.com, X13 seems a bit slower to find

Signed-off-by: Tanguy Pruvot <tanguy.pruvot@gmail.com>
New version 1.0.4, update README, NEWS

Add .dirstamp files to gitignore

Signed-off-by: Tanguy Pruvot <tanguy.pruvot@gmail.com>
Merge pull request #14 from tpruvot/master

Fix for issue #13 + 2 new cpuminer features
Add Freshcoin algo (fresh)

+ a small change to x13/14/15 which reduce a bit executable size

Signed-off-by: Tanguy Pruvot <tanguy.pruvot@gmail.com>