add optimistic locking
Add django-concurrency to settings
exclude VersionField
Merge branch 'master' of github.com:axce1/python-news-digest
hot fix
Merge pull request #5 from axce1/master

hot fix
show message about conflict
Merge pull request #6 from axce1/master

show message about conflict
Merge branch 'master' of github.com:alrusdi/python-news-digest into locks
Merge branch 'locks' of github.com:alrusdi/python-news-digest into locks
verbose_name для картинки выпуска