feat(404): auto fill search box with URL fragment that was not found

Signed-off-by: Pablo Iranzo Gómez <Pablo.Iranzo@gmail.com>

templates/404.html

@@ -14,7 +14,6 @@ <h1>That page doesn't exist!</h1>
     </header>
 </div>
 
-
 <div class="row-fluid">
     <div class="span8 offset2">
         <p>Sorry, but the page you are looking for cannot be found. It seems that the page you were trying to reach doesn't exist, or may be it has just moved, or it no longer exists.</p>
@@ -28,4 +27,22 @@ <h1>That page doesn't exist!</h1>
         </div>
     </div>
 </div>
+
+<script type="text/javascript">
+    // Get Current location as the initial search item
+    var newurl = (' ' + window.location.pathname).slice(1);
+
+    // Replace "/" in path into spaces
+    var newurl = newurl.replace(/\//g, ' ');
+
+    // Remove html extension
+    var newurl = newurl.replace(/.html/g, ' ');
+
+    // Replace - by ' '
+    var newurl = newurl.replace(/\-/g, ' ');
+
+    // Fill search field with resulting string
+    document.getElementById('tipue_search_input_404').value = newurl;
+</script>
+
 {% endblock content %}