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>
Add Freshcoin algo (fresh)
New version 1.0.4, update README, NEWS

Add .dirstamp files to gitignore

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