Segment identify call

[mciureanu]

I guess it's more of a feature request. Segment track calls for successful and failed logins are nice to have, but the most important are the identify calls, which should be called every time the user logs in, registers, or changes properties: https://segment.com/docs/connections/spec/identify/

This is the building block of getting users to other "destinations", and it makes sense that these calls are sent from the auth0.