Use Arrays.asList in MessageMixinAbstract instead of MUtil.list.

src/com/massivecraft/massivecore/mixin/MessageMixinAbstract.java

@@ -19,7 +19,7 @@ public abstract class MessageMixinAbstract implements MessageMixin
 	@Override
 	public boolean messageAll(String message)
 	{
-		return this.messageAll(MUtil.list(message));
+		return this.messageAll(Arrays.asList(message));
 	}
 	
 	@Override