added the multiLaplace method
add table of contents
add table of contents
python interface for FisherLDA
fisherfaces example added
fisherfaces python_interface example added
added integration data files
corrected indentation and minor issues
Merge pull request #2488 from Saurabh7/nbtables

add table of contents to nbs
Merge pull request #2484 from yorkerlin/develop

add the multiLaplace method
Merge pull request #2487 from kislayabhi/fisher

FisherLDA examples added
Reduced accuracy of CustomKernel.sum_block unit-test

To prevent failure on Travis buildbot OSX caught in job
https://travis-ci.org/shogun-toolbox/shogun/jobs/32569634
Merge pull request #2494 from lambday/develop

Reduced accuracy of CustomKernel.sum_block unit-test
added functions in SGNDArray