urls: Move the json/tutorial_status endpoint to be an API-style route.

static/js/tutorial.js

@@ -4,7 +4,7 @@ var exports = {};
 
 function set_tutorial_status(status, callback) {
     return channel.post({
-        url:      '/json/tutorial_status',
+        url:      '/json/users/me/tutorial_status',
         data:     {status: JSON.stringify(status)},
         success:  callback,
     });