Uploads Marvelmind firmware to beacons or modems via DFU
Uses "dfu-util" software ( https://dfu-util.sourceforge.net/ )
dfu-util executable was built and tested under Ubuntu 18.04.
To rebuild in different Linux distributions, run "./build"

1. Connect beacon or modem via USB.
Refer to the operating manual for more details about preparing the device for DFU updating.
https://marvelmind.com/pics/marvelmind_navigation_system_manual.pdf

2. Copy DFU file corresponding to your device from the software package to this folder.

3. Run "./dfuse <file name>" from the terminal for uploading file to the device.

4. If you get error running dfu-util on stage 3, rebuild dfu-utils from sources by running "./build",
   then try stage 3 again.
   If you get message "No DFU capable USB device", install the driver
   by running "./driver_install",  then try stage 3 again