Need tool to help gateway attach to wifi

[bradjc]

For the Triumvi deployments in particular, it would be useful to have a way to configure the edison's wifi connection without requiring Ethernet to be plugged in first. There are a couple ways to do this:

1. Use something like: https://github.com/sabhiram/raspberry-wifi-conf. This does the whole "make device into an access point, let you connect to its wifi and then configure it" thing that I'm not a huge fan of. In this case it's even a little worse as you have to navigate to a magic IP in a browser after connecting.
2. Upgrade adv-gateway-ip to provide services if no network connection is found. Then I imagine we could write a summon app that lets you select the wifi to connect to and a password if needed. This tool may be helpful in this: https://github.com/tlhunter/node-wireless