Added /xp and /toggledownfall commands from vanilla

src/main/java/org/bukkit/command/defaults/ExpCommand.java

@@ -0,0 +1,48 @@
+package org.bukkit.command.defaults;
+
+import org.bukkit.Bukkit;
+import org.bukkit.ChatColor;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public class ExpCommand extends VanillaCommand {
+    public ExpCommand() {
+        super("xp");
+        this.description = "Gives the specified player a certain amount of experience";
+        this.usageMessage = "/xp <player> <amount>";
+        this.setPermission("bukkit.command.xp");
+    }
+
+    @Override
+    public boolean execute(CommandSender sender, String currentAlias, String[] args) {
+        if (!testPermission(sender)) return true;
+        if (args.length != 2) {
+            sender.sendMessage(ChatColor.RED + "Usage: " + usageMessage);
+            return false;
+        }
+
+        Player player = Bukkit.getPlayerExact(args[0]);
+
+        if (player != null) {
+            try {
+                int exp = Integer.parseInt(args[1]);
+
+                Command.broadcastCommandMessage(sender, "Giving " + exp + " exp to " +  player.getName());
+
+                player.giveExp(exp);
+            } catch (NumberFormatException ex) {
+                sender.sendMessage("Invalid exp count: " + args[1]);
+            }
+        } else {
+            sender.sendMessage("Can't find user " + args[0]);
+        }
+
+        return true;
+    }
+
+    @Override
+    public boolean matches(String input) {
+        return input.startsWith("xp ") || input.equalsIgnoreCase("xp");
+    }
+}