settings: added 'polls' to INSTALLED_APPS
db: added models in app 'polls'
added and enabled app 'django.contrib.admin'
polls: added module 'admin' with config for models 'Poll' and 'Choice'
polls.admin: added 'PollAdmin'
polls.admin: added 'ChoiceInline'
Poll: added attributes to method 'was_published_recently', and added it to 'list_display' (admin)