Version 2.1 (25 May 2017)
 * Switched to roxygen
 * Fixed documentation
 * Fixed some data dimension errors
 * Restricted uschange data to 1970+

Version 2.0 (23 February 2017)
 * Updated for 2nd edition of book
 * Updated data where available
 * Corrected some help files
 * Added new data

Version 0.5 (14 March 2013)
  * added vn, debitcards, departures and cafe data sets.
  * missing value removed from end of usmelec.

Version 0.4 (30 April 2012)
  * euretail data added.

Version 0.3 (26 March 2012)
  * More data added

Version 0.2 (22 February 2012)
  * More data added
  * Changed description so it now mentions the book rather than the workshop.

Version 0.1 (4 June 2011)
  * Started adding data files for FPP workshop.

