Google recommends setting an empty robots.txt Disallow for their user agent, Mediapartners-Google for sites serving their ads. To prevent users from having to add these entries on their own, we can add them automatically. Each provider now has a $crawler_user_agent parameter, and the Disallows are filterable.
…ngle()". Changing approach. This reverts commit 5026edc.
corrected wrong default size of "medium rectangle" from 320x250 to 300x250