adds tests for set_cpd and get_cpd
variable name change
adds test_set_observation_single_state_reset_false and test_set_observation_multiple_state_reset_false tests
adds StateError exception
adds test_reset_observation_node_none and test_reset_observations_node_not_none
adds NodesNotFoundError
adds test_reset_observations_node_error
add test_is_observed
adds a TODO
adds a few tests
Merge pull request #54 from ankurankan/dev

Dev