check and update student names and emails

[Darake]

** Wait for SIS **

At the moment students name and email are only checked and updated on login. This isn't very useful after the student has gotten a device since the student won't likely log in to the site anymore.

Need to figure out how, where and when to update student info.
Possible ideas:

• Periodically check info with a cron job. Maybe once a month.
• When sending email, check and update info before sending emails.