* Update knowledge.ipynb

* Update notebook.py

* Update knowledge.ipynb

* bringing it all together in notebook

* Added python code for psource (#613)

* added psource code with optional highlighting (#613)

* Update notebook.py

* Update nlp.ipynb

* line ran too long; shortening

* Update learning.ipynb

* Update notebook.py

* Update .travis.yml

* Update logic.ipynb

* canvas -> notebook in games

* Rename canvas.py to notebook.py

* 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

* Fix flake8 warnings

* Remove unnecessary #noqa

* Fix doctest

* Exclude test files from flake8 check

* Fix flake8 for main files

* Add flake8 check to build

* Update search.py

Commenting issues fixed (spacing and punctuation was off sometimes).

* Update agents.py

* Update canvas.py

Grammar

* Update grid.py

* Update learning.py

Added period

* Update logic.py

Fix quoting

* Update mdp.py

Fixed quoting

* Update nlp.py

Capitalization and punctuation fixes

* Update planning.py

* Update probability.py

* Update rl.py

'th' to 'the'

* Update search.py

* Update text.py

* Update utils.py

* Update utils.py

* Update utils.py

* Update learning.py

Typo

* Update utils.py

* fixes an error in search.py

* modifies the method name 'exec' which is a built-in name

* Error message of python errors

* Added Canvas_TicTacToe class

* Added TicTacToe to notebook

* Added games.ipynb

* moved js file to js folder

* added kernel test notebook

* modified kernel.ipynb

* Added canvas support

* Added mouseclick to canvas

* add TicTacToe to canvas

* removed import statement in games.py

* corrected HTML tags

* Added comments and doctring

* Added methods for drawing with normalized units

* Added text support

* Fixed int type during normalization