calefaction/app/views/shared/_header.html.erb

<header>
  <%= link_to({controller: 'tools', action: 'index'}, {id: 'home-link'}) do %>
    <%= corp_logo_tag %>
    <span id="corp-name">
      <%= AdminSetting.get('corp_name') %>
    </span>
  <% end %>
  <span id="user-links">
    <%= link_to "Signup", controller: "users", action: "create" %>
    &bull;
    <%= link_to "Login", controller: "users", action: "login" %>
    &bull;
    <%= link_to "Admin", controller: "admin", action: "index" %>
  </span>
</header>