Notebook security with either password or token possible?

[David Slochower]

I've been running a custom notebook configuration for awhile using SSL and the old password setup via `certfile` and `keyfile`. 

Now the default is token access and I see a lot of interfaces supporting the use of a token for authorization (I'm thinking specifically of nteract's hydrogen and PyCharm's remote notebook feature). Is there an easy way to allow access with either the password I've setup OR a token that is generated when launching the notebook server?