Add ability to pass columns names as argument to table_for helper

```ruby
table_for user.posts, :title, :created_at do
  column :actions do |post|
    link_to 'Approve', approve_admin_posts_path(post, method: :post)
  end
end
```
Merge pull request #3496 from bolshakov/feature/table_columns

Add ability to pass columns names as argument to table_for helper