Revert "SoftwareSerial library to the new format"

This reverts commit 38c3bbb.

Author: cmaglie

libraries/SoftwareSerial/arch/avr/SoftwareSerial.cpp renamed to hardware/arduino/avr/libraries/SoftwareSerial/SoftwareSerial.cpp

@@ -41,7 +41,7 @@ The latest version of this library can always be found at
 #include <avr/interrupt.h>
 #include <avr/pgmspace.h>
 #include <Arduino.h>
-#include <SoftwareSerial_Class.h>
+#include <SoftwareSerial.h>
 //
 // Lookup table
 //