Merge branch 'master' into ide-1.5.x

Author: cmaglie

hardware/arduino/avr/cores/arduino/CDC.cpp

@@ -116,10 +116,12 @@ bool WEAK CDC_Setup(Setup& setup)
 
 void Serial_::begin(unsigned long /* baud_count */)
 {
+	peek_buffer = -1;
 }
 
 void Serial_::begin(unsigned long /* baud_count */, byte /* config */)
 {
+	peek_buffer = -1;
 }
 
 void Serial_::end(void)

hardware/arduino/avr/cores/arduino/USBAPI.h

@@ -36,8 +36,9 @@ struct ring_buffer;
 class Serial_ : public Stream
 {
 private:
-	int peek_buffer = -1;
+	int peek_buffer;
 public:
+	Serial_() { peek_buffer = -1; };
 	void begin(unsigned long);
 	void begin(unsigned long, uint8_t);
 	void end(void);