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Fix memory leak in LibSVMFile.cpp -- ./tests/unit/unit-SGSparseMatrix
Fix memory leak in KernelPCA constructor.
Example of CustomKernel with IndexFeatures in libshogun.
fix function name.
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.
Proper naming of temp files put to /tmp to allow easy cleanup of failed tests.
Merge pull request #2032 from Jiaolong/fg_multilabel_cvc

Entrance task #1916: factor graph model for multi-label classification example - thanks to Jiaolong
added sum and squared sum methods in CKernel
fixed errors in ID3ClassifierTree unittest
Merge pull request #2172 from mazumdarparijat/decision_tree

error in ID3ClassifierTree unittest fixed
fixed legends and plots in PCA notebook.
Merge pull request #2169 from lambday/develop

added sum and squared sum methods in CKernel
Merge pull request #2170 from tklein23/naming_of_serialization_temp_files

Proper naming of temp files in /tmp
Merge pull request #2173 from kislayabhi/develop

fixed legends and plots in PCA notebook.
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