OpenSSH 6.6p1 Ciphers, MAC, Kex changes

	* New tested configuration for OpenSSH 6.6p1
	* Added curve25519-sha256@libssh.org to KexAlgorithms (6.6p1)
	* Added chacha20-poly1305@openssh.com to Ciphers (6.6p1)
	* Added umac-128-etm@openssh.com and hmac-ripemd160 to MAC (6.6p1)