Classes to support DojoLand

DojoLand.cs

	abstract class Person
	{
		public string Name { get; set; }

		protected Person(string name)
		{
			Name = name;
		}
	}

	sealed class Sensei : Person
	{
		public Sensei(string name) : base(name)
		{
		}
	}

	sealed class Student : Person
	{
		public Student(string name) : base(name)
		{
		}
	}