Fix parse double exception which occures if you try to run tests in
environment with Non-English default locale
Implement test case for DescriptiveStatistics which proves
that it computes kurtosis incorrectly for large samples
Fix formula for computing kurtosis (provided by
machinelearning.ru)
Merge pull request #68 from ArtyomBaranovskiy/statistics-kurtosis

Statistics: DescriptiveStatistics Kurtosis fix, I18N test fix