Revert "Objavi oglas: redirect to 'U izradi' and CSS-hidden real logic for it"

This reverts commit ac8c5dbd0433a75b346306112c1240644194f6ab.
add a registration and login form
toggle_path > ad_toggle_path in views
better detection if ad is favorite in views
add pretty flash messages
add hr locale for devise
add a form for editing account details