Added support for Arduino Esplora

(Filtered from arduino/Arduino@948a5c8)

Author: cmaglie

bootloaders/caterina/Caterina.c

@@ -197,6 +197,8 @@ const USB_Descriptor_String_t ProductString =
 	.UnicodeString          = L"Arduino Leonardo" 
 	#elif DEVICE_PID == 0x0037
 	.UnicodeString			= L"Arduino Micro   "
+	#elif DEVICE_PID == 0x003C
+	.UnicodeString			= L"Arduino Esplora "
 	#else
 	.UnicodeString			= L"USB IO board    "
 	#endif

bootloaders/caterina/Caterina.h

@@ -57,6 +57,8 @@
 # PID = 0x0036
 # official Micro PID
 # PID = 0x0037
+# official Esplora PID
+# PID = 0x003C
 
 # MCU name
 MCU = atmega32u4

bootloaders/caterina/Descriptors.c

@@ -55,6 +55,8 @@ const u16 STRING_IPRODUCT[17] = {
 	'A','r','d','u','i','n','o',' ','L','e','o','n','a','r','d','o'
 #elif USB_PID == 0x8037
 	'A','r','d','u','i','n','o',' ','M','i','c','r','o',' ',' ',' '
+#elif USB_PID == 0x803C
+	'A','r','d','u','i','n','o',' ','E','s','p','l','o','r','a',' '
 #elif USB_PID == 0x9208
 	'L','i','l','y','P','a','d','U','S','B',' ',' ',' ',' ',' ',' '
 #else