safeguard for invalid options
move marsyas scripts to src/marscript, change extension to ".mrs"
apps: inspector, runner: expect ".mrs" instead of ".mars" extension
scripts: separate generic classifier from kea, demonstrate inclusion

* Separate classifier wrapper that allows selection of ZeroR,
  Gaussian or SVM classification into separate script.

* Include classifier scripts in kea script as a prototype named
  "GenericClassifier".