make this strategy accept the "passReqToCallback" option

I have the same requirements for 'post login processing' when someone logs in with a "remember-me" cookie (as compared to other auth strategies in use)

in order to be able to call my handler(s) for 'post login processing' I need to pass in the `req` object - in my case session data needs to be set, specifically I track the kind of login used so that I can request/require that a user verifies 'account-id + passwd' before updating sensitive data if the user initially logged in with a "remember-me" cookie (or some other one-time-pass)
use "self" not "this" - in order to reference the correct object!
signed cookies are stored in the signedCookies object rather than the cookies one
actually read the documentation and tested this.
Merge branch 'master' of https://github.com/tandartsnl/passport-remember-me

Conflicts:
	lib/strategy.js