buildings: allow defining anim tiles as belonging to a building

git-svn-id: https://micropolis.googlecode.com/svn/trunk/micropolis-java@814 d9718cc8-9f43-0410-858b-315f434eb58c

src/micropolisj/engine/TileSpec.java

@@ -231,4 +231,9 @@ public class TileSpec
 			return peekChar() != -1;
 		}
 	}
+
+	public String toString()
+	{
+		return "{tile#"+tileNumber+"}";
+	}
 }