Add expires returnUrl param after a successful login

[pfferrari]

What I did

I updated the redirect method launched after a successful customer login to send a new additional expires GET param to the returnUrl. The expires param will contain the ISO date generated from the token expires Date returned by the js-auth library.

Checklist

• Make sure your changes are tested (stories and/or unit, integration, or end-to-end tests).
• Make sure to add/update documentation regarding your changes.
• You are NOT deprecating/removing a feature.

[acasazza]

Well done!