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
Added subset stack in feature selection

Needed for keeping track of selected features which is required in a
classification scenario for unseen data.
added functions in SGNDArray
move doc/md into git@github.com:shogun-toolbox/shogun.wiki.git submodule
added binary denoising notebook
Merge pull request #2490 from Jiaolong/nd_array

added functions in SGNDArray
Merge pull request #2467 from Jiaolong/nb_binary_denosing

added binary denoising notebook
Fix submodule repository type of shogun.wiki
update data-checkout to 24b8341
Merge pull request #2532 from lambday/develop

Added subset stack in feature selection
Added dummy main in variational approximation example

Fixes compilation error (reproduced with macosx 10.9 and its default compiler)
fixed #2536
Merge pull request #2537 from khalednasr/fix_rbm_notebook

fixed #2536