Very start of plugin hooks and openstreetmap pluginification

- Added start of template hook code to pluginapi.py
 - Started to break openstreetmap into plugin; moved templates
 - Added plugin hooks in media and image media templates

... almost certainly, none of this works yet. :)

mediagoblin/plugins/geolocation/templates/mediagoblin/plugins/geolocation/map.html

@@ -0,0 +1,60 @@
+{#
+# 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/>.
+#}
+
+{% block geolocation_map %}
+  {% if app_config['geolocation_map_visible']
+        and media.media_data.gps_latitude is defined
+        and media.media_data.gps_latitude
+        and media.media_data.gps_longitude is defined
+        and media.media_data.gps_longitude %}
+    <h3>{% trans %}Location{% endtrans %}</h3>
+    <div>
+      {%- set lon = media.media_data.gps_longitude %}
+      {%- set lat = media.media_data.gps_latitude %}
+      {%- set osm_url = "http://openstreetmap.org/?mlat={lat}&mlon={lon}".format(lat=lat, lon=lon) %}
+        <div id="tile-map" style="width: 100%; height: 196px;">
+	  <input type="hidden" id="gps-longitude"
+		 value="{{ lon }}" />
+	  <input type="hidden" id="gps-latitude"
+		 value="{{ lat }}" />
+	</div>
+        <script> <!-- pop up full OSM license when clicked -->
+          $(document).ready(function(){
+            $("#osm_license_link").click(function () {
+              $("#osm_attrib").slideToggle("slow");
+              });
+          });
+        </script>
+        <div id="osm_attrib" class="hidden"><ul><li>
+          Data &copy;<a
+            href="http://www.openstreetmap.org/copyright">OpenStreetMap</a>
+          contributors
+          </li><li>Imaging &copy;<a
+          href="http://mapquest.com">MapQuest</a></li><li>Maps powered by
+          <a href="http://leafletjs.com/"> Leaflet</a></li></ul>
+        </div>
+        <p>
+	  <small>
+	    {% trans -%}
+	      View on <a href="{{ osm_url }}">OpenStreetMap</a>
+	    {%- endtrans %}
+	  </small>
+	</p>
+    </div>
+  {% endif %}
+{% endblock %}