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

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)
