List the activity done on a page

See http://markmail.org/message/h44rwvx2plhnnulc

When viewing a page we display the history in a tab at the bottom. The idea would be, for example, to add another tab named "Activity" that would display the activity stream for that page.

It would contains things such as "page updated", "comment added", "page restored from recycle bin", "tag added", etc.