Parallelize AUC, P/R tests

git-svn-id: http://myrrix-recommender.googlecode.com/svn/trunk@517 0d189622-dca1-7e23-9e30-e8815eb7bd2f
Introduce a refactored means of executing tasks in parallel for several simple common cases

git-svn-id: http://myrrix-recommender.googlecode.com/svn/trunk@518 0d189622-dca1-7e23-9e30-e8815eb7bd2f