Merge branch 'master' of https://github.com/42cc/mass_post_office
ticket:225 Unsubscription is implemented
Merge branch 'master' into t225_unsubscribe_link

Conflicts:
	mass_post_office/admin.py
	mass_post_office/models.py
	mass_post_office/tests/test_models.py
changed texts of templates. pep8
Merge branch 't225_unsubscribe_link'