1.3 (2013-09-25)
  * Bug fixed in saving items
  * Some code optimization

1.2 (2013-6-25)
  * Tktable used for transforming raw scores
  * Now package works even if not installed under R home directory, code suggested by K. Antal
  * A few more warning and error messages were added

1.1 (2013-04-20)
  * Minor bugs fixed
  * Code improvements for compatibility
  * Fixed some typographical errors