Merge pull request #152 from ankurankan/dev

Addition in TreeCPD and implement RuleCPD
Merge pull request #153 from ankurankan/dev

added __init__ to tests and corrected replaced assertOrderedDictEqual wi...
Merge pull request #157 from ankurankan/dev

Implementation of RuleCPD and tests
Merge pull request #160 from ankurankan/dev

Fixes #129 and #158
Update README.md
Merge pull request #164 from ankurankan/dev

Adds to_tree_cpd method to RuleCPD class and some minor bug fixes
Merge pull request #165 from ankurankan/dev

adds to_rule_cpd method in TreeCPD class
Update README.md
Update README.md
Merge branch 'dev' of https://github.com/pgmpy/pgmpy into dev
edited docs for Factor class [refs #137]
Corrected tests for factor product and reduce according to the new representation of the factor class [refs #137]