Improved error handling in many places to detect missing files or NULL file handles.
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close() file before dying.
reduced the execution time of the autoencoders notebook
add the notebook
removed eigen3/viennacl includes from some class headers
fixed the renaming issue
fixed #2502
Merge pull request #2504 from yorkerlin/develop

fixed the renaming issue
Set R modular to stable in README.md. Update Interfaces doc and NEWS.
Merge pull request #2507 from matthuska/r-modular-news

Set R modular to stable in README.md. Update Interfaces doc and NEWS.
Merge pull request #2482 from khalednasr/master

reduced the execution time of the autoencoders notebook
Merge pull request #2505 from khalednasr/neuralnets_cpp_examples

fixed #2502
further reduced the execution time of the autoencoders notebook
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