Adds simple signup / login form

[donalmacanri]

... for users without GitHub accounts. All authentication related functions are moved to the AuthService.

[chesleybrown]

Remove console.log

[chesleybrown]

After enabling simple login option in firebase and trying to signup, it doesn't quite work. Instead of creating the user under participants all it does is create an entry like the following:

{
    "participants": [
        {
            "simplelogin:2": {
                "status": "online"
            }
        }
    ]
}

I'm logged in, but have no name set. Am I forgetting any setup step?