Update LMNN notebook using far less number of features in the metagenomics example
Merge pull request #1698 from iglesias/feature/lmnn

Update LMNN notebook using far less number of features in the metagenomi...
Fix memleak in CSVFile_unittest.cc
Fix memory leak in ProbingSampler_unittest.cc
this unit test is still leaking...
Redesign of the figures in the neighbourhood section of the LMNN notebook
Other minor updates to the notebook as well