class for notify
use PrePAN::Notify to notify review
notify vote by PrePAN::Notify
fix duplicate unread_count++
refactor PrePAN::Notify
Register email
Merge branch 'qahackathon' of github.com:CPAN-API/prepan into qahackathon
Add empty string to email
Added `email()` method to User
class for sendmail
Merge branch 'master' into qahackathon
Merge branch 'qahackathon' of github.com:CPAN-API/prepan into qahackathon
fix duplicate notify
email by worker.  but must fix content of mail
PrePAN::View
Add email notification setting.
Merge branch 'qahackathon' of github.com:CPAN-API/prepan into qahackathon
bug dfix
mail template
Updated schema