* Updated README.md

* Added function to plot NQueensProblem

* Added queen image

* Changed plotting function for NQueensCSP

* Replaced f'{}' with .format() notation

* Added Pillow to travis.yml

* Updating submodule

* Moved viz code to notebook.py + changes

* Changed use of 'next'

* Added networkx to .travis.yml

* Added others to .travis.yml

* Remove time from .travis.yml

* Added linebreaks and fixed case for no algo

* Fixed spaces for args

* Renamed *search as *search_for_vis

* Update learning.ipynb

* Update notebook.py

* Update .travis.yml

* Moved Canvas_TicTacToe

* Remove jupyter from travis.yml

* Remove requirements for travis

* Install ipython for travis

* Improved Canvas_TicTacToe

* Added canvas minimax

* Increased Canvas_minimax tree depth to 3

* Added canvas example for alpha-beta pruning

* Exclude test files from flake8 check

* Fix flake8 for main files

* Add flake8 check to build