AutoCollector - make recordPageViewsOnExit the default recordPageViews

[adamkasprowicz]

if you want to record time spent on a page, you need to record page view event when the guest is leaving the page. This changes the default behaviour of the AutoCollector, so we need to add this in the next major version.
Right now to get information about time spent on the page devs need to call "clicks" collection, it's not intuitive.