making packageable as chrome extension

I added a manifest.json so the entire directory can be made into a chrome app. This makes it a bit easier to use for me, as it doesn't require a local web server, and can still talk to our internal network etcd cluster.

It could be submitted to the chrome store, or the readme could be updated to tell people how to load an unpacked extension. Chrome store could possibly give the easiest experience, but I would rather let the original author upload it if you are interested.

I also had to put jquery/angular in a lib folder. I think there is a way to load them from cdn, but I gave up and copied them down.