Update version of pyparsing from 2.1.8 to 2.2 in requirements.txt:
Update version of pyparsing from 2.1.8 to 2.2 in requirements.txt:

Refer #902. Since 2.1.8 wasn't available on conda, Fetching package metadata ...........
Solving package specifications: .

# All requested packages already installed.
# packages in environment at /home/ankur/anaconda3/envs/py3:
#
networkx                  1.11                     py34_0
numpy                     1.11.3                   py34_0
pandas                    0.19.2              np111py34_1
pyparsing                 2.2.0                    py34_0
scipy                     0.18.1              np111py34_1
wrapt                     1.10.8                   py34_0   was failing with the error: PackageNotFoundError.

khalibartan/pgmpy,khalibartan/pgmpy,pgmpy/pgmpy,ankurankan/pgmpy,pgmpy/pgmpy,ankurankan/pgmpy