Clean up include guards and EOF newlines (#65)

* Replaced include guards with #pragma once

* All source files now have exactly one newline appended

Some files had either two newlines at the end or none (which isn't POSIX compliant). This patch fixes that.

wpilibc/shared/include/Commands/PIDSubsystem.h

@@ -5,8 +5,7 @@
 /* the project.                                                               */
 /*----------------------------------------------------------------------------*/
 
-#ifndef __PID_SUBSYSTEM_H__
-#define __PID_SUBSYSTEM_H__
+#pragma once
 
 #include "Commands/Subsystem.h"
 #include "PIDController.h"
@@ -70,5 +69,3 @@ class PIDSubsystem : public Subsystem, public PIDOutput, public PIDSource {
   virtual void InitTable(std::shared_ptr<ITable> table);
   virtual std::string GetSmartDashboardType() const;
 };
-
-#endif