Resolved bug#83
add __name__ == __main__
Merge pull request #87 from ankurankan/dev

add __name__ == __main__
removed redundant line
Merge pull request #88 from ankurankan/dev

removed redundant line
replace cumprod with prod
add requirement for numpy
Merge pull request #89 from ankurankan/dev

Minor Changes
Revert "add requirement for numpy"

This reverts commit ec0951bcb36546297768c3c5a957cad4163b61d7.
tests for Factor class
Update .coveragerc

Add numpy and nose to omit list.
Merge branch 'dev' of https://github.com/pgmpy/pgmpy into dev
minor change
removed internal use function from documentation
tests for Factor class
Merge pull request #90 from ankurankan/dev

Tests for Factor Class
correct tests
Merge pull request #91 from ankurankan/dev

correct tests
tests for factor_product
Merge pull request #92 from ankurankan/dev

tests for factor_product