title: insert element at the beginning of std::forward_list
body: <p>I want to remove element from <code>std::forward_list</code> and insert it to the beginning of list 
  But there is no insert method ... It just has <code>insert_after</code> !</p>
  
  <p>How can I  insert element at the beginning of <code>std::forward_list</code> ?</p>