code: function destroy(req, res, next) {
    db.posts.del(req.params.post, function(err) {
      if(err) { return next(err); }
      res.json(null);
      signals.emit('post:destroy', req.params.post);
    });
  }
docs: URL: /posts/:post
  
  Method: DELETE
  
  Events:
  
  * `post:destroy`
  
  Status codes:
  
  * `200` ok
  * `404` not found