Version 1.2 (2016-03-14)
    o Fix a bug with parallelisation using 'snow' (the only option available on
      Windows).
    o In case of missing values in either items or scales matrix and 
      impute = FALSE the function stops and displays a message. 

Version 1.1 (2016-02-25)
    o Update reference on help page and added citation file.

Version 1.0 (2015-02-02)
    o First release on CRAN.

