Release with minor improvements:
- added get_class method to weka.core.utils which returns the Python class object associated with the classname in dot-notation
- from_commandline method in weka.core.utils now takes an optional classname argument, which is the classname (in dot-notation) of the wrapper class to return – instead of the generic OptionHandler
- added Kernel and KernelClassifier convenience classes to better handle kernel based classifiers