Added sphinx_bootstrap_theme into sphinxext.
Merge pull request #236 from abinashpanda/dev

Added sphinx_bootstrap_theme into sphinxext.
Modified gen_rst.py to remove dependency from sklearn.
Merge pull request #237 from abinashpanda/dev

Modified gen_rst.py to remove dependency from sklearn.
New version of gen_rst.py supporting python3.
Merge branch 'dev' of https://github.com/pgmpy/pgmpy into dev
Modified gen_rst.py to work in python3 env.
Modified requirements.txt to install pkg-config.
Modified index.rst to point to proper examples dir.
Merge remote-tracking branch 'upstream/dev' into issue224