Merge pull request #216 from ankurankan/dev

very minor change
TabularCPD init cleaned with tests
added example to docstring and fixed doc string
fixed test_cpd_init_event_card_not_int
fixed TabularCPD's marginalize get_cpd and normalize
Fixed docs and some methods
fixed TabularCPD's normalize method
fixed get_cpd method of TabularCPD
fixed reduce method of TabularCPD
fixed TabularCPD tests
Merge pull request #217 from ankurankan/uniform_bayes_markov

Cleaned Bayesian model and CPDs