added part about FITC large scale regression since roman fixed the bugs recently
initial draft for (x-) evaluation, and model selection notebook
add shogun namespace to ref/unref
do not call exit_shogun in java / csharp examples

- calling exit_shogun at the end of a java / csharp example is
dangerous: not all shogun objects might have been freed by the garbage
collector at this stage so calling exit_shogun was observed to destroy
essential helper objects that all shogun objects require at runtime
leading to unexpected crashes.
test cross validation fold indices
modified one file to include all tests
remove file
fixed typos in crossvalidation tests
Merge pull request #1796 from karlnapf/develop

added FITC part of GP notebook and X-validation notebook draft
test covering of all indices
test covering of all indices
added check for disjoint folds
Merge pull request #1795 from Saurabh7/foldindices

Foldindices
knn example
add Chiyuan Zhang's multiclass notebooks
use dmcs instead of gmcs to run c# examples
rename to not have spaces
Fix memory leak due to SGVector::clone in KNN
add LOOxval
improve KNN notebook