add file ProbModelXML.py along with an example of student model
Example of ProbModelXML
correct get_node function
adds function check_model
add ProbModelXMLWriter class
adds methods to ProbModelXMLObject class
adds dump and indent methods and generate_probmodelxml function
add ProbModelXMLReader class
add feature to accept states as string in set_states method
adds methods make_network, add_graph_properties add_node and add_edges
add write_probmodel and read_probmodel functions
adds docs to ProbModelXML
adds __all__
add docs
Merge pull request #70 from ankurankan/dev

Adds check_model method to BayesianModel and add ProbModelXML.py