add cucumber test for ads
fix pagination
add panel user for admin
Merge branch 'cucumber_tests'

Conflicts:
	app/views/ads/_form.html.slim
	features/ad.feature
	features/step_definitions/ad_steps.rb
	features/step_definitions/user_steps.rb
Merge branch 'user_panel_in_admin'

Conflicts:
	app/models/ability.rb