Fixing problem with cronjob [IN PROGRESS]

  * added more error-checks and validity checks in Sequential.pm to
    avoid warnings in .err files (they appeared in
                                  /tmp/pageviews-full-cron/ )
  * added more docs to clear up what the cronjob does(also separation of
    concerns cleared up from that point of view
  * moved and renamed files depending on the environment
        - local-cron-*
        - stat1-cron-*

Change-Id: I99f085722e85b576e931c23bd0df2c118db98005