Remote Docker Connection Definition Support

It is now possible to define a remote SSH connection to a docker daemon. For example:

using (
        var container =
          new Builder().UseHost()
            .UseSsh("192.168.1.27").WithName("remote-daemon")
            .WithSshUser("solo").WithSshKeyPath("${E_LOCALAPPDATA}/lxss/home/martoffi/.ssh/id_rsa").Host()
            .UseContainer()
            .UseImage("postgres:9.6-alpine")
            .WithEnvironment("POSTGRES_PASSWORD=mysecretpassword")
            .Build())
      {
        Assert.AreEqual(ServiceRunningState.Stopped, container.State);
      }

Creates a remote connection called remote-daemon. It uses WSL on windows, therefore the ssh keypath is in lxx but on Linux and Mac it should be along the lines of ~/.ssh/id_rsa. Please Check the section arount Connecting to Remote Docker Daemons (https://github.com/mariotoffia/FluentDocker#connecting-to-remote-docker-daemons) for more information.

This do address the task #60 as well.

Cheers,
Mario