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Fix memory leak in LibSVMFile.cpp -- ./tests/unit/unit-SGSparseMatrix
Fix memory leak in KernelPCA constructor.
Fix CustomKernel-unittest bug.
Fixed Kernel.cpp Warning.
Merge pull request #2164 from pl8787/indexfeatures

Fix CustomKernel-unittest bug.
Merge pull request #2161 from yorkerlin/develop

fixed the file path issue for the variational example
added PCA notebook to the NEWS.
Merge pull request #2165 from kislayabhi/develop

added PCA notebook to the NEWS.
memory leak fixed
Merge pull request #2166 from mazumdarparijat/decision_tree

memory leak fixed
Example of CustomKernel with IndexFeatures in libshogun.
add to news
fix function name.
Merge pull request #2168 from Saurabh7/develop

minor changes mkl nb
Add IndexFeature to Python interface.
Remove the print function.
Added factor graph model for multilabel classification example in libshogun.
Add new example for index feature in custom kernel.