chartbookR: Creation of chartbooks

#' Creation of chartbooks
#' 
#' Offers convenient download and transformation of Bloomberg and FRED (St. Louis Fed) data, plotting of customized charts, and saving to Powerpoint.
#'
#' @section Details:
#'The chartbookR package consists of four types of functions for chartbook creation:
#' 
#' \itemize{
#' \item Data download: \code{\link[chartbookR]{getBBG}} and \code{\link{getFRED}}
#' \item Data transformation: \code{\link{Transform}}
#' \item Customized plotting: \code{\link{LineChart}}, \code{\link{BarChart}} and \code{\link{HiChart}}
#' \item Exporting to Powerpoint: \code{\link{makePPT}}
#' }
#'  
#' @section Notes:
#' While all functions are based on existing packages, they make the chartbook creation an efficient and convenient process.
#' 
#' In order to use the \code{\link{getBBG}} function, you need to have a running Bloomberg terminal session. If this is not the case, you can still use \code{\link{getFRED}} to download freely available data from the St. Louis Fed database (\url{https://fred.stlouisfed.org}).
#' 
#' The \code{\link{HiChart}} function relies on highcharts (www.highcharts.com) - a Highsoft product which is not free for commercial and Governmental use.
#' 
#' @section Author/Maintainer:
#' Kilian Reber \email{kilian.d.reber@gmail.com}
#'  
#' @section Contributors:
#' Tryggvi Thoroddsen \email{tryggvithoroddsen@gmail.com}
#'  
#' @section See Also:
#' \url{https://github.com/kilianreber}
#' 
#' @examples
#' #US Unemployment (FRED data only)
#' zoo <- getFRED(tickers = c('UNRATE', 'NROU'), names = c('Unemployment Rate', 'Natural Unemployment Rate'), na = FALSE)
#' LineChart(title = "US Unemployment", data = zoo, y1 = 'in percent', rec = TRUE)
#' 
#' #Global Unemployment Rates (requires Bloomberg)
#' zoo <- getBBG(tickers = c("EHUPUS", "EHUPEU", "EHUPGB", "EHUPJP Index"), names = c("United States", "Eurozone", "United Kingdom", "Japan"), freq = "QUARTERLY", time = "30Y")
#' LineChart(title = "Global Unemployment Rates", data = zoo, l1 = 1:4, y1 = "in %", y1_def = c(2,15,2), grid = TRUE, rec = TRUE)
#' 
#' #US Budget Balance vs. Unemployment Rate (requires Bloomberg)
#' zoo <- getBBG(tickers = c("EHUPUS", "EHBBUS"), na = FALSE, names = c("Unemployment", "Budget Balance"), start = as.Date("1969-01-01"))
#' LineChart(title = "US Budget Balance vs. Unemployment Rate", data = zoo, l1 = 1, d2 = 2, y1="Unemployment (%)", y2 = "Budget Balance (%GDP)", y2_def = c(-10,2,2), y2_rev = TRUE, leg = "top", rec = TRUE)
#' 
#' @docType package
#' @name chartbookR
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