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AttributeError: 'HMM' object has no attribute 'Pi' #44

Description

@ChayaSt

This error is raised when I try to call estimator.stationary_probability.
Here's the traceback:

/Users/sternc1/anaconda/lib/python2.7/site-packages/bhmm-0.6.1+22.gcc92643-py2.7-macosx-10.6-x86_64.egg/bhmm/estimators/maximum_likelihood.pyc in stationary_probability(self)
    217         r""" Stationary probability, if the model is stationary """
    218         assert self._stationary, 'Estimator is not stationary'
--> 219         return self._hmm.Pi
    220 
    221     def _forward_backward(self, itraj):

AttributeError: 'HMM' object has no attribute 'Pi' 

hmm.Pi doesn't exist but hmm._Pi does.

I can open a PR to fix this by changing return self._hmm.Pi to return self._hmm._Pi

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