Add emails.write scope to login client.
- Needed to send notifications via notification server email API

[#76898458] https://www.pivotaltracker.com/story/show/76898458

Signed-off-by: Rob Gallagher <rgallagher@pivotallabs.com>
/password_reset endpoint now returns userId along with code
 - This will be used by the NotificationsService to send notifications via the /User endpoint

[#76898458] https://www.pivotaltracker.com/story/show/76898458