Kill trailing whitespace in erb files

app/views/admin/users/edit.html.erb

@@ -1,15 +1,15 @@
 <div id="c-admin-users">
   <div id="a-edit">
     <h1>Edit User: <%= @user.name %></h1>
-    
+
     <%= form_tag(admin_user_path(@user), :method => :put, :class => "simple_form") do %>
       <%= hidden_field_tag "id", @user.id %>
-      
+
       <div class="input integer optional">
         <label for="user_level" class="optional">Level</label>
         <%= user_level_select(:user, :level) %>
       </div>
-    
+
       <%= submit_tag "Update" %>
     <% end %>
   </div>