* Add bidirectional search + update h function

* add bidirectional search test

* Update search.py

* Update test_search.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

* Create pytest.ini

* Update CONTRIBUTING.md

* DataFile Update

* Update learning.py

* Update search.py

* Update test_learning.py

* Update test_text.py

* Add files via upload

* Update text.ipynb

* Update search-4e.ipynb

* Create CONTRIBUTING.md

* Update games.py

* Create test_games.py

* Create games.ipynb

* Added test for fol_fc_ask()

* Optimization of fol_fc_ask()

* Faster fol_fc_ask()

* Removed subst for rules in KB

* Delete test_grid.py

* Delete grid.ipynb

* Delete grid.py

* Move grid functions to utils

* Move grid tests to utils

* Update agents.py

* Update mdp.py

* Update search.py

* Update games.ipynb

* Update games.ipynb

* Update learning.ipynb

* Add files via upload

* Update search.ipynb

* html tags don't work + typo

* Update search.ipynb

* Update search.ipynb

* Update search.py

* Update test_search.py

is supposed to return an answer when errT converges, not errV
used to return size of when err_val converges but is supposed to return the size with minimum err_val

* removed flake8 errors

* fixed remaining flake8 errors

* fixed loop

* added space

* Create function to initialize random weights

* Add sigmoid derivative function

* Update csp.py

* Add test

* Update learning.ipynb

* Update test_learning.py

* Resolve conflicts

* Update rl.py

* Update mdp.py

* Minor changed to rl notebook

* Update test_mdp.py

* Update mdp.py

* start planning notebook

* reorder cell execution order

* incorporating suggestions

* Fix flake8 warnings

* Remove unnecessary #noqa

* Fix doctest

* Modified relevant_pages()

* Additional tests for relevant_pages()

* Update learning.ipynb

* Delete perceptron.png

* Add new Perceptron image

* Update Perceptron Implementation

* Add Gaussian Function

* Added Tests

Add tests for Continuous Naive Bayes + Means/Standard Deviation

* Update learning.py

* Commenting Fix

* Add test for gaussian

* test for every class

* Update test_learning.py

* Round float results to make sure test passes