Fixes #77, update sites without search

Sites without search now do not include search.js or lunr.js,
making the javascript for those pages much faster to load.

source/javascripts/all_nosearch.js

+//= require_tree ./lib
+//= require_tree ./app
+//= stub ./app/search.js
+//= stub ./lib/lunr.js

source/layouts/layout.erb

@@ -24,7 +24,11 @@ under the License.
     <%= stylesheet_link_tag :screen, media: :screen %>
     <%= stylesheet_link_tag :print, media: :print %>
     <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
-    <%= javascript_include_tag  "all" %>
+    <% if current_page.data.search %>
+      <%= javascript_include_tag  "all" %>
+    <% else %>
+      <%= javascript_include_tag  "all_nosearch" %>
+    <% end %>
 
     <% if language_tabs %>
       <script>