Fix Reminder Bug

The list of users to send reminder email to was too large, it should
be filtered to only those users with emails, haven't submitted this
week and want a reminder.
Merge pull request #9 from wilsonodk/reminder-bug-fix

Fix Reminder Bug

The list of users to send reminder email to was too large, it should
be filtered to only those users with emails, haven't submitted this
week and want a reminder.