Allow for an "extrahead" template where themers can include extra css, js, etc

mediagoblin/templates/mediagoblin/base.html

@@ -33,6 +33,9 @@
     <!--[if lt IE 9]>
       <script src="{{ request.staticdirect('/js/extlib/html5shiv.js') }}"></script>
     <![endif]-->
+
+    {% include "mediagoblin/extrahead.html" %}
+
     {% block mediagoblin_head %}
     {% endblock mediagoblin_head %}
   </head>

mediagoblin/templates/mediagoblin/extrahead.html

@@ -0,0 +1,19 @@
+{#
+# GNU MediaGoblin -- federated, autonomous media hosting
+# Copyright (C) 2011, 2012 MediaGoblin contributors.  See AUTHORS.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+-#}
+
+{# Add extra head declarations here for your theme, if appropriate #}