add navbar
Top navbar layout improved.
Replace social links & navbar nav from right to left.
Merge branch 'feature/add_navbar' into staging

Conflicts:
	app/assets/stylesheets/custom.css
	app/views/layouts/web/shared/_navigation.html.haml
	app/views/layouts/web/shared/_social.html.haml
	config/locales/ru.yml
	log/untranslated.ru.yml