Fixes issues where the new Googlebot user agents aren't flagged correctly.

Fixed
The new version of Googlebot (smartphone) emulates Chrome 41, which shouldn't really be flagged as an unsupported browser given it's actually a bot. So there are now user agent exceptions (specifically tailored to Google for now) that will allow trusted bots to access the site regardless of version number or browser name. In a future update this will be manageable via the plugins settings.