Changes in version 0.1-8 (12/17/2015)
    * fixed several problems in the vignette.
    * predict for realRatingMatrix accepts now type = "ratingMatrix" to returns
      a completed rating matrix.
    * Negative values for given in evaluationScheme implement all-but-given 
      evaluation.
    * method "SVD" used now EM-based approximation from package bcv.

Changes in version 0.1-7 (7/23/2015)
    * NAMESPACE now imports non standard R packages.

Changes in version 0.1-5 (8/18/2014)
    * Fixed NAMESPACE problems.
    * evaluation of ratings is now better integrated into evaluate.
    * binarize keeps now dimnames.

Changes prior to 0.1-4 (1/11/2013)
    * many

Alpha version 0.1-0 (1/23/2010)
