brary, plus two new
          traits classes <a class="link" href="reference/is_rvalue_reference.html" title="is_rvalue_reference">is_rvalue_reference</a>
          and <a class="link" href="reference/is_lvalue_reference.html" title="is_lvalue_reference">is_lvalue_reference</a>.
          Fixes <a href="https://svn.boost.org/trac/boost/ticket/4407" target="_top">#4407</a>
          and <a href="https://svn.boost.org/trac/boost/ticket/3804" target="_top">#3804</a>.
        </li>
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