Initial work on overpass based query API

app/assets/javascripts/leaflet.query.js

@@ -0,0 +1,19 @@
+L.OSM.query = function (options) {
+  var control = L.control(options);
+
+  control.onAdd = function (map) {
+    var $container = $('<div>')
+      .attr('class', 'control-query');
+
+    var link = $('<a>')
+      .attr('class', 'control-button')
+      .attr('href', '#')
+      .attr('data-original-title', I18n.t('javascripts.site.queryfeature_tooltip'))
+      .html('<span class="icon query"></span>')
+      .appendTo($container);
+
+    return $container[0];
+  };
+
+  return control;
+};