This class can be used to keep track of the pages
navigated by a user, so it can generate back or next links
providing a similar effect to the use of the
Javascript history.go() function. It uses
sessions to store an array variable that holds the
URL of each page of a site that the user accesses.
It can limit the number of pages that are kept in
the history array. It may also ignore pages
accessed with the POST method or with certain URLs
based on options that define exclusion regular
expressions. The class can generate links to go
back to the last page or the first page that was
recorded.
