Added SSL configuration options to EasyNetQ.

Hi this is my first pull request, so I am not sure if I am doing this right ;).  Just added support for SSL in EasyNetQ.  I followed the tutorial here (http://www.rabbitmq.com/ssl.html) using cygwin and openssl on windows to create the certificates.  Then once the server is properly configured and is listening on a port for SSL, with the modification that I made in EasyNetQ, we can now do something like this to connect to a Bus:

var config = new ConnectionConfiguration()
				{
					Hosts = new[] { new HostConfiguration() { Host = "localhost", Port = 5671 } },
					UserName = "username",
					Password = "password",
					VirtualHost = "/"
				};
			config.Ssl.Enabled = true;
			config.Ssl.ServerName = System.Net.Dns.GetHostName();
			config.Ssl.AcceptablePolicyErrors = SslPolicyErrors.RemoteCertificateNotAvailable | SslPolicyErrors.RemoteCertificateChainErrors;

Since I didnt want to verify clients certificates I set the AcceptablePolicyErrors flags to those values.  Let me know if you can test this, we are using EasynetQ in a fairly large project and absolutely need SSL.

Thanks!