check_date_inputs       Helper function for statsgrokse()
check_page_inputs       helperp function for statsgrokse() that checks
                        and corrects page input
download_data           function downloading prepared URLs
expand_ts               Helper function for statsgrokse() that
                        transforms a time span into a series of months
expand_ts_v             vectorized version of expand_ts()
get_data                function for getting data (download +
                        extraction)
html                    function downloading content
http_header             function for pasting together the HTTP
                        user-agent field
prepare_urls            function preparing URLs for downlaod
prev_month_end          function to get date of end of prev month
prev_month_start        function to get date of start of prev month
statsgrokse             Function for getting access statistics for
                        wikipedia pages from stats.grok.se
wp_date                 Package specific 'as.Date()' function
wp_day                  Function to extract the day
wp_month                Function to extract the month
wp_wday                 Function to extract the day of the week
wp_year                 Function to extract the year
wp_yearmonth            function for getting year and month of a
                        timestamp
