Problem with installation

@Mido_Mughrabi had a problem with installing the app, as it finished with an unknown error. My first assumption is that the package "electron-prebuilt" must be installed globally in order to work correctly, thus the dev-dependency is not sufficient... I'll remove it for now and update the README accordingly.

If you have a folder "electron-prebuilt" under "BezLinApp/node_modules/", then npm remove electron-prebuilt in the app-folder (maybe you also have to rm the folder from node_modules...) and then sudo npm install electron-prebuilt -g.

After this, the folder /usr/lib/node_modules/electron-prebuilt should exist.

Then, try again.