using OneToOne field
using distinct in get_users_queryset
translatable field names
user_should_be_agree is considered in MailingList.get_users_queryset
subcsrived is checked from MailingList.user_should_be_agree
subscriptionsettings__subscribed treated correctly
fixed typo
Merge branch 'master' of https://github.com/42cc/mass_post_office
Re-usable application was created
ticket:227 Merged with master
ticket:227 Merge branch 't227_massemail_model' of https://github.com/42cc/mass_post_office into t227_massemail_model

Conflicts:
	admin.py
	models.py