[openstreetmap/openstreetmap-website] Added 'Reverse Directions' link (#1693)

[Tom Hughes]

tomhughes requested changes on this pull request.



> @@ -111,6 +113,20 @@ OSM.Directions = function (map) {
     return endpoint;
   }
 
+  $(".directions_form .reverse_directions").on("click", function() {
+    var input_from = endpoints[0].input.val();
+    var input_to = endpoints[1].input.val();
+    var latlng_from = endpoints[0].latlng;
+    var latlng_to = endpoints[1].latlng;
+
+    endpoints[0].setLatLng(latlng_to);
+    endpoints[1].setLatLng(latlng_from);
+    endpoints[0].input.val(input_to);
+    endpoints[1].input.val(input_from);
+
+    $(".directions_form .routing_go").trigger("click");
+  });

I think it would be better to do this in the same way we do it in other places, along these lines:

```
OSM.router.route("/directions?" + querystring.stringify({
  from: $("#route_to").val(),
  to: $("#route_from").val()
}));
```

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