Added BukkitCommandSender and WorldEditPlugin.wrapCommandSender.

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

@@ -0,0 +1,13 @@
+package com.sk89q.worldedit;
+
+/**
+ * Thrown when an operation is run that needs an actual player, not a console.
+ *
+ */
+public class PlayerNeededException extends RuntimeException {
+    private static final long serialVersionUID = 1L;
+
+    public PlayerNeededException() {
+        super("This command cannot be run on the console."); 
+    }
+}