Added IO_Toggle demo and make file

example/stm32f4/Projects/IO_Toggle/main.c

@@ -18,7 +18,6 @@
   * <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>
   ******************************************************************************  
   */ 
-
 /* Includes ------------------------------------------------------------------*/
 #include "stm32f4_discovery.h"
 #include "stm32f4xx_conf.h"