Fix issue #318: Change Manager superclass
Define custom manager in Post model
Chmod +x on runtests.py / remove the --with-specplugin unknown argument
Merge branch 'master' into fix_issue318
Created tests to custom manager inserted in Post model
Class PublishableManager returned to Manager class of the Django
Merge pull request #324 from gilsondev/fix_issue318

Class PublishableManager returned to Manager class of the Django