Kill trailing whitespace in erb files

app/views/wiki_pages/show.html.erb

@@ -1,20 +1,20 @@
 <div id="c-wiki-pages">
   <div id="a-show">
     <%= render "sidebar" %>
-    
+
     <section id="content">
       <h1 id="wiki-page-title">
-        
+
         <%= @wiki_page.pretty_title %>
-        
+
         <% if @wiki_page.is_locked? %>
           (locked)
         <% end %>
       </h1>
-      
+
       <div id="wiki-page-body" class="prose">
         <%= format_text(@wiki_page.body) %>
-        
+
         <% if @wiki_page.presenter.antecedent_tag_alias %>
           <p class="hint">This tag has been aliased to <%= link_to @wiki_page.presenter.antecedent_tag_alias.consequent_name, posts_path(:tags => @wiki_page.presenter.antecedent_tag_alias.consequent_name) %>.</p>
         <% end %>
@@ -23,7 +23,7 @@
           <p class="hint">The following tags are aliased to this tag: <%= raw @wiki_page.presenter.consequent_tag_aliases.map {|x| link_to(x.antecedent_name, posts_path(:tags => x.antecedent_name))}.join(", ") %>.</p>
         <% end %>
       </div>
-      
+
       <div id="wiki-page-posts">
         <%= @wiki_page.post_set.presenter.post_previews_html(self) %>
       </div>