update authentication system to Devise

app/views/pipes/index.html.erb

@@ -1,7 +1,7 @@
 <h2>Pipes</h2>
 <%= link_to 'New Pipe', new_pipe_path %>
 
-<br /><br />
+<br><br>
 
 <table class="nicetable">
   <tr class="header"><td>ID</td><td>Name</td><td>Slug</td><td>URL</td><td>Date</td></tr>
@@ -15,5 +15,5 @@
     </tr>  
   <% end %>
 </table>
-<br />
+<br>
 <%= will_paginate @pipes %>