<% if user_signed_in? %>
• <%= link_to(current_user.email, edit_user_registration_path) %>
• <%= link_to('Sign out', destroy_user_session_path, :method => :delete) %>
<% else %>
• <%= link_to('Sign up', new_user_registration_path) %>
• <%= link_to('Sign in', new_user_session_path) %>
<% end %>