add public articles
update some views
mer
looks like already done
add peges to guest
fix tests
fix tests
fix seed propetry
fix schema
Merge pull request #23 from SoftServeUniversity/add_image_markdown

add image upload for markdown
final
final1
merge master
delete add_exhibits_form
I've modified:   app/controllers/exhibitions_controller.rb, spec/controllers/admin/articles_controller_spec.rb
Merge pull request #24 from SoftServeUniversity/add_public_articles

Add public articles
update