interactivePlots        function that generates interactive plots of
                        the package downloads logs from CRAN
movingFn                generic fn that computes the "fn" on a moving
                        window
processPckg             main function to analyze a list of packages in
                        a given time frame
retrievePckgData        function to download the data from the CRAN
                        logs for an specific package
staticPlots             function that generates visual trends of the
                        package downloads logs from CRAN, it will
                        generate 4 plots: two histograms, a pulse plot
                        and the main plot is a plot of the downloads as
                        a function of time
summaries               function to display the summary of the data
