remove aes-gcm algos from Ciphers, because of http://www.openssh.com/txt/gcmrekey.adv

Signed-off-by: Patrick Meier <patrick.meier111@googlemail.com>
Merge pull request #5 from atomic111/master

remove aes-gcm algos from Ciphers, because of http://www.openssh.com/txt/gcmrekey.adv