v2.0.0

• [BC] Remove Google Bot, Yahoo and BingBot from the crawler's list, because those search engines support _escaped_fragment_ and want to ensure people aren't penalized for cloaking
• Prerender listener now triggers two events: "prerender.pre" and "prerender.post". This allows you to cache the response and return it without hitting the Prerender service
• The priority the listener is registered has been lowered from 10000 to 1000