lab 5: taja: WordCountResultsSampleCalculator: added another method that
takes a minRank as well as the number of top ranks; updated tests for the
sample calculator.
lab 5: taja: added logging to the WordCountResultsZingChartRenderer to log the
prepared data value, and updated WordCountJobResultsController to use a min
rank of 4 when generating the chart.
lab 5: added lab5 directory with files used in getting the presentation ready.