Optimize vendor/product description string display code in MassStorageHost.

Remove all Host mode class demos other than the CDCHost class driver demo, so that they can be re-added as they are made once the host mode class framework is designed.

Fixed USB_Host_SendControlRequest() not re-suspending the USB bus when initial device ready-wait fails.

Fixed USB Pad regulator not being disabled on some AVR models when the USB_OPT_REG_DISABLED option is used.

LUFA/Drivers/USB/LowLevel/LowLevel.c

@@ -186,6 +186,8 @@ void USB_ResetInterface(void)
 		
 	if (!(USB_Options & USB_OPT_REG_DISABLED))
 	  USB_REG_On();
+	else
+	  USB_REG_Off();
 	
 	USB_CLK_Unfreeze();