Implement  Rand Hurwitz and Neyman - Pearson criterions.

Added files : RandGurvitsCriterion, RandNeymanPearsonCriterion, Helper
(consists of the methods which are the same for different criterions ).
Updated files: Model, Solution, CriterionFactory, ConvexHull,
RandMinMaxCriterion, RandomizedSolutionForm.