adds @staticmethod decorator to _check_node_string
Merge branches 'abinashpanda-dev' and 'dev' into dev
Merge pull request #62 from abinashpanda/dev

modified __init__ of TabularCPD
Merge branch 'dev' of https://github.com/pgmpy/pgmpy into dev
Adds IndependenceAssertion Class
Adds IMap class
Improve docs of IMap class
Improve docs
edit doc test
_factor_product modified for bug fixes
changed _factor_product.c for bug fix
improved variable names
add tests for IndependenceAssertion Class
added doc for add_factorized_product
update docs for class IMap
tests for IMap class
Merge pull request #64 from ankurankan/dev

IMap Class with tests
Merge branch 'dev' of https://github.com/pgmpy/pgmpy into dev