Support for ed25519 ssh client authentication keys

[amorsen]

Right now connect() in Ssh.java has the following:

					public String getAlgName() {
						switch (kpair.getKeyType()) {
						case KeyPair.RSA:
							return "ssh-rsa";
						case KeyPair.DSA:
							return "ssh-dss";
						case KeyPair.ERROR:
							return "ERROR";

Would it be possible to extend that to support other key types, such as ed25519? RSA and DSA keys are getting deprecated in many organizations.

Thank you.