fix NRE when UserRelation is not set
update README
CommandLineProgram: fix measures behavior
EvaluationResults: add API doc
UserAttributeKNN: remark that fold-in is not supported
SocialMF: more flexible Iterate() method
rm unnecessary newlines
IRecommender: space to tab
add --measures to test
Merge remote-tracking branch 'parent/master'
Makefile: complete testsuite
update Changes file
BPRMF: fix NRE when accessing random number generator
fix release checklist
Merge remote-tracking branch 'parent/master'
rm debug WriteLine
DataSet: whitespace change
rm TODO comment
new recommender ExternalRatingPredictor; SetupRecommender() code sharing between command-line programs
add default evaluation measure to rating_based_ranking