Merge pull request #874 from karlnapf/master

New class for data generation
Merge pull request #875 from karlnapf/master

quickfix
fix %template warning and potential compile error
add objective test for ocas
add test for combined kernel weights getter/setter
set #threads to one *before* training and epsilon to sth very low
add serialization test for combined kernel
add sparse features serialization test
add valgrind target
my first unit-test to ensure that Gaussian blobs data is produced roughly the right way
examples work again so use them