New McMMOItemSpawnEvent

- Changed all of mcMMO to use one drop method to facilitate new event
- Added a missing bit of copyright notice to last event

src/main/java/com/gmail/nossr50/events/McMMOPlayerLevelUpEvent.java

@@ -1,3 +1,19 @@
+/*
+	This file is part of mcMMO.
+
+    mcMMO is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    mcMMO is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with mcMMO.  If not, see <http://www.gnu.org/licenses/>.
+*/
 package com.gmail.nossr50.events;
 
 import org.bukkit.entity.Player;