corrected typos in error messages
some renaming and cleaned up includes
added some first unit tests for the quadratic time mmd
added an illustrativ example for the quadratic time MMD
Merge pull request #895 from karlnapf/master

new unit tests and examples for quadratic time MMD
make use of precomputed kernel when estimating type I and II errors
Merge pull request #896 from karlnapf/master

minor changes to example