Abstract metric and NDCG beginning
RMSE
NDCG still not done.
NDCG
forgotten commits
RMSE change getRMSE to computeRMSE
Updated nDCG, added unit tests for rmse, ndcg
Added documentation
double ndcg not initialized before computeRMSE is run
Initialize double ndcg
Updated SimplaParser to take split token as input
Merge pull request #28 from alansaid/master

RMSE and NDCG