install devise
install omniauth
install omniauth, provide social networks interaction architecture using facebook as an example
redirect to registration form if required fields (email) aren't filled in
add token to oauth authentications, install and configure koala for facebook graph interacting, configure facebook permissions
fix migrations
Merge branch 'fix_migrations'
fix conflict
bundle update
add initial necessary data in seeds
Merge branch 'master' into import_legacy
add field categories, more initial data for seeds
importing types and fields
fill in seeds db with classification