Fixed usb_products on some AVR boards

Author: cmaglie

hardware/arduino/avr/boards.txt

@@ -218,7 +218,7 @@ micro.build.mcu=atmega32u4
 micro.build.f_cpu=16000000L
 micro.build.vid=0x2341
 micro.build.pid=0x8037
-micro.build.usb_product=Arduino Micro
+micro.build.usb_product="Arduino Micro"
 micro.build.board=AVR_MICRO
 micro.build.core=arduino
 micro.build.variant=micro
@@ -248,7 +248,7 @@ esplora.build.mcu=atmega32u4
 esplora.build.f_cpu=16000000L
 esplora.build.vid=0x2341
 esplora.build.pid=0x803c
-esplora.build.usb_product=Arduino Esplora
+esplora.build.usb_product="Arduino Esplora"
 esplora.build.board=AVR_ESPLORA
 esplora.build.core=arduino
 esplora.build.variant=leonardo
@@ -414,7 +414,7 @@ LilyPadUSB.build.mcu=atmega32u4
 LilyPadUSB.build.f_cpu=8000000L
 LilyPadUSB.build.vid=0x1B4F
 LilyPadUSB.build.pid=0x9208
-LilyPadUSB.build.usb_product=LilyPad USB
+LilyPadUSB.build.usb_product="LilyPad USB"
 LilyPadUSB.build.board=AVR_LILYPAD_USB
 LilyPadUSB.build.core=arduino
 LilyPadUSB.build.variant=leonardo