Merge pull request #304 from rmassoth/sort_th_fix

Added closing tag to anchor for glyphicon.

Author: staticdev

src/django_sorting_bootstrap/templates/sorting_bootstrap/sort_th_frag.html

@@ -4,7 +4,8 @@
     <div class="sortoptions">
       <a href="{{ url }}"
          class="toggle glyphicon glyphicon-chevron-{% if ascending %}up{% else %}down{% endif %}"
-	 title="{% trans 'Toggle sorting' %}"/>
+	       title="{% trans 'Toggle sorting' %}">
+      </a>
     </div>
   {% endif %}
   <div class="text">