Code cleanup

- Changing header file ifndef define to pragma once's
- Removed duplicate output_com.h's

Lib/delay.h

@@ -1,7 +1,7 @@
 /* Teensyduino Core Library
  * http://www.pjrc.com/teensy/
  * Copyright (c) 2013 PJRC.COM, LLC.
- * Modifications by Jacob Alexander 2013-2014
+ * Modifications by Jacob Alexander 2013-2015
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files (the
@@ -29,8 +29,7 @@
  * SOFTWARE.
  */
 
-#ifndef __DELAY_H
-#define __DELAY_H
+#pragma once
 
 // ----- System Includes -----
 
@@ -85,5 +84,3 @@ uint32_t micros(void);
 
 void delay(uint32_t ms);
 
-#endif
-