Supressed unchecked warnings
Working on #43
Merge branch 'master' of https://github.com/recommenders/rival

Conflicts:

	rival-examples/src/main/java/net/recommenders/rival/examples/movielens100k/CrossValidatedMahoutKNNRecommenderEvaluator.java
Cleaning example CVMKNNRE

Put paths as local parameters of each function
Fixed example CVMKNNRE

Problem with names to feed the Mahout's FileDataModel
Also fixed a problem in AbstractErrorMetric when empty users appeared