Basic Authentication Support

[bmcd]

If you use azure/kaleido and use a basic auth url such as https://username:password@host:port, it doesn't work. Web3js uses XMLHttpRequest under the hood, which doesn't automatically turn the credentials into the Authorization header. Need to do this manually.

Also, we should probably add separate fields for username/password or auth token

[bmcd]

http(s) basic auth is working, and websocket + basic auth is working in firefox but not chrome. I haven't been able to figure out what implementation difference in Chrome is causing it not to work. They may just not support basic auth with websockets.