Kill trailing whitespace in erb files

app/views/sessions/new.html.erb

@@ -9,20 +9,20 @@
           <label for="name">Name</label>
           <%= text_field_tag :name %>
         </div>
-        
+
         <div class="input">
           <label for="password">Password</label>
           <%= password_field_tag :password %>
-          
+
           <%= check_box_tag :remember, "1", true %>
           <label for="remember" id="remember-label">Remember</label>
         </div>
-        
+
         <div class="input">
           <%= submit_tag "Submit" %>
         </div>
       <% end %>
-    </section>   
+    </section>
   </div>
 </div>