Code cleanup

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

Output/pjrcUSB/output_com.h

@@ -19,8 +19,7 @@
  * THE SOFTWARE.
  */
 
-#ifndef __output_com_h
-#define __output_com_h
+#pragma once
 
 // ----- Includes -----
 
@@ -116,5 +115,3 @@ int Output_getchar();
 int Output_putchar( char c );
 int Output_putstr( char* str );
 
-#endif
-