Bot Definitions are outdated

We currently match "Baiduspider+(" but it uses a user agent "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)" which is not matched.

We do not have Yandex at all, e.g. "Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)"

We do not have EventGutu at all, e.g. "Mozilla/5.0 (compatible; EventGuruBot/1.0; +http://www.eventguru.com/spider.html)"

We should probably also review all other entries to check if they are still up to date.