added BayesianModel.py to dev-branch
test push
Revert "test push"

This reverts commit 4f1c72c09bef1ad3d3b2565359d341dca6dbc2f3.
BayesianModel.py - pending = add_obsevation, remove_observation ; and fixing rule_for_parents() and rule_for_states()
Merge pull request #2 from snigam3112/dev

BayesianModel.py - pending = add_obsevation, remove_observation ; and fi...
made pep8 compliant
corrected isinstance calls
Fixed and made states() and parents() as generators. Remaining: add_observation, remove_observation.
made string_to_tuple private method
added travis build file and changed dir structure
fixed typo
updated travis.yml
added tests
updated .travis.yml
updated travis.yml
updated travis.yml
fixed typo
updated travis.yml
updated travis.yml
changed assertItemsEqual to assertSameElements, assertItemsEqual not available in python3