* 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

* Create function to initialize random weights

* Add sigmoid derivative function

* Fix flake8 warnings

* Remove unnecessary #noqa

* Fix doctest

* 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

* Added test for FIFOQueue

* Updated FIFOQueue

* Updated FIFOQueue

* FIFOQueue using deque

* fixed flake8 warnings

added test for count() and mode()

* Add flake8 config file

* Fix flake8 for test files

Add InfixOps, refactor expo and Expr

Remove count_if, find_if, every, some, Struct; replace them with modern
Python equivalents.

Used tool 2to3 to finish the porting to Python 3 plus some fixes by
hand.

modified print statements in agents.py to make it work in Py3, changed utils_test.py with regard to new utils.py

This is from tmrts, pull request https://github.com/tmrts/aima-python/commit/4cc647ae3e1d4ab9a1fc4fc9be652f52b4e72851 , but I'm bad at git, so it was easier for me to merge by creating this file here.