Enable pylint on examples. (#51)

* Enable pylint on examples.

* Python3.7 enabled.

* updated dist and python versions.

* Minor fixes in travis script. Removed typo from pip install.

* Removed python3.8-dev from the list.

Merge pull request #11 from dilawar/master

Made script compatible with both python2 and python3.

Merge pull request #7 from rahulgayatri23/master

Parallel Solver example

Changed few things.

Scripts to generate figures for publication