issue-65 PomdpXReader Class r=ankurankan
added the test pomdpx xml file
PomdpX Reader Class
Merge branch 'dev' of https://github.com/pgmpy/pgmpy into pomdpX
minor changes
minor changes - pep8 issues, pythonic code, removed test file.
added methods and tests to support Decision Diagram parameter format
used String IO in tests, included docstrings
Init method for Noisy or models [refs #147]
add_variables method for NoisyOrModels [refs #147]
del_variable method for NoisyOrModels [refs #147]
tests for NoisyOrModels [refs #147]
minor corrections [refs #147]
minor correction in add_variable method [refs #147]
changes in add_variable method to make inhibitor probability array uniform because otherwise numpy treats it
as a 1D with dtype object
algorithm to compute the probabilities of output variable
New Line
adds identity_factor method [refs #171]
Merge pull request #170 from ankurankan/dev

Noisy-Or Models
Merge pull request #163 from jp111/pomdpX

PomdpX Reader Class