Clean up and removal of some old exceptions.

src/main/java/com/sk89q/worldedit/InvalidItemException.java

@@ -20,13 +20,12 @@
 package com.sk89q.worldedit;
 
 /**
- *
- * @author sk89q
+ * Thrown when an invalid item is specified.
  */
 public class InvalidItemException extends DisallowedItemException {
-    private static final long serialVersionUID = -2739618871154124586L;
 
     public InvalidItemException(String type, String message) {
         super(type, message);
     }
+
 }