Moving extrahead.html -> extra_head.html because it's easier to read

mediagoblin/templates/mediagoblin/base.html

@@ -34,7 +34,7 @@
       <script src="{{ request.staticdirect('/js/extlib/html5shiv.js') }}"></script>
     <![endif]-->
 
-    {% include "mediagoblin/extrahead.html" %}
+    {% include "mediagoblin/extra_head.html" %}
 
     {% block mediagoblin_head %}
     {% endblock mediagoblin_head %}