Implemented server re-registration when a server closes / updates

- When a server is closed, it will disappear from the server list
- When a player joins a server, the number of spaces left will decrease
- Servers now disappear instead of duplicating
- Added tests for ServerDescription
- Added documentation for new classes

Tags: #story[1247]

src/test/java/seng302/gameServer/server/TestServerDesc.java

@@ -0,0 +1,48 @@
+package seng302.gameServer.server;
+
+import org.junit.Test;
+import seng302.gameServer.ServerDescription;
+
+import static org.junit.Assert.assertTrue;
+
+public class TestServerDesc {
+    @Test
+    public void testEquals(){
+        ServerDescription one = new ServerDescription("a", "b", 10, "asd",  1234);
+        ServerDescription two = new ServerDescription("a", "b", 10, "asd",  1234);
+
+        assertTrue(one.equals(two));
+    }
+
+    @Test
+    public void testNotEqualName(){
+        ServerDescription one = new ServerDescription("a", "b", 10, "asd",  1234);
+        ServerDescription two = new ServerDescription("a2", "b", 10, "asd",  1234);
+
+        assertTrue(!one.equals(two));
+    }
+
+    @Test
+    public void testNotEqualMap(){
+        ServerDescription one = new ServerDescription("a", "b", 10, "asd",  1234);
+        ServerDescription two = new ServerDescription("a", "ba", 10, "asd",  1234);
+
+        assertTrue(!one.equals(two));
+    }
+
+    @Test
+    public void testNotEqualPort(){
+        ServerDescription one = new ServerDescription("a", "b", 10, "asd",  1234);
+        ServerDescription two = new ServerDescription("a", "b", 10, "asd",  12341);
+
+        assertTrue(!one.equals(two));
+    }
+
+    @Test
+    public void testNotEqualAddress(){
+        ServerDescription one = new ServerDescription("a", "b", 10, "as1d",  1234);
+        ServerDescription two = new ServerDescription("a", "b", 10, "asd",  1234);
+
+        assertTrue(!one.equals(two));
+    }
+}