added some stuff

[EricSchles]

most of the work here is very light - pgmpy isn't available in anaconda - so I included a small bit of code -

import sys
sys.path.append('/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/')

that looks for the python 3 framework - this only seems to be a problem on mac with jupyter notebook.

This is an initial thought of how to handle this, perhaps some other thoughts would be good around this.

[ankurankan]

@EricSchles Thanks for the PR. I have a few suggestion for changes:

1. In the notebook 1, in the markdown cell next to In[67], you need to change the text saying the accuracy is 56.67 %.
2. In the notebook 1, can you also rerun the whole notebook so that all the Input and Out cell numbers are in order.