nwjs beagle getting started app: Report 12

nwjs beagle getting started app: Report 12

Week 12:
-Finished usb storage detection on Windows
-Finished work on flashing on Windows
-Working unmounting of devices for flashing on Linux, Mac, Windows
-flashing of eMMC (downloads, modifies, reuploads /boot/uEnv.txt)

-merged code:
https://github.com/arianepaola/beaglebone-getting-started/tree/nwjs

Issues:
-none

Goals for next week:
-add pull requests to original issue list
-Documentation
-Work BBBlfs for USB flashing
-Add beagle artwork / instructions to make usability easier
-Updates to the user interface design
-Work on builds