Merge pull request #2528 from khalednasr/bugfix

further reduced the execution time of the autoencoders notebook
Fixed logical bug in DependenceMaximization

In dependence maximization based feature selection, the features
related to highest measure should be removed instead.
Merge pull request #2529 from lambday/feature/selection

Fixed logical bug in DependenceMaximization
fixed uncought exception problem in neuralnets c++ examples