* NQueensProblem returns tuples as states

* Reran search.ipynb

* List to tuple

* Changed default value and add heuristic function

* Added astar_search for NQueensProblem

* Added tests for NQueensProblem

* Refactor EightPuzzle class

* return instead of print

* Added tests for EightPuzzle

* Review fixes

* Review fixes

* Fixed tests

* Update inverted commas in docstrings

* 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

* Fix EightPuzzle class implementation

* Fix EightPuzzle class implementation (#710)

* Address style issues (#710)

* Add SimpleProblemSolvingAgent

* Fix typo in search.py

* rebase with master

* solve error

* solve error

* solve error

* Update search.ipynb

* Update PeakFindingProblem code to allow diagonal motion

* Fix unit test issues

* update PeakFindingProblem to take actions as input param

* Refactor code in search.py

Partially solves #687

* Added tests for search.py

* Updated readme

* Removed extra newline

* Fixed seed

* Update README.md

* Added docstring for minimal-consistent-det

* Add bidirectional search + update h function

* add bidirectional search test

* Update search.py

* Update test_search.py

* 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

* 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 search.py

* Update test_search.py

* Fix flake8 warnings

* Remove unnecessary #noqa

* Fix doctest

* Update search.py

* Update test_search.py

* minor edits and notes

* removed fuzzywuzzy

* Add 8-Queens Test

* Optimization without veering from pseudocode

* Variable renaming

* Update search.py

* Optimization

* Update test_search.py

* Fairer reproduction

Implemented Genetic Algorithm. Because #477 had unnecessary edits,

minor error fixes.

* added documentation, standardised docstring quotes

* made search.py pep8 compatible using flake8

* fixed bug in OnlineDFSAgent

* Update utils.py

in pseudo code the sequence of arguments is " WEIGHTED-SAMPLE-WITH-REPLACEMENT(N, S, W)"  same must follow in function "particle_filtering" in the file probability.py

* Update learning.py

weight_sample_with_replacement sequence of args

* Update probability.py

 weighted_sample_with_replacement sequence of args

* Update search.py

* Modern string formatting in csp.py.

* Modern string formatting in games.py.

* Modern string formatting in learning.py.

* Modern string formatting in nlp.py.

* Modern string formatting in probability.py.

* Modern string formatting in search.py.

* Replaced {0\!r} by {} if %s.

* Corrected a typo.

* 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

Seems like a typo, results in error:
TypeError: 'int' object is not iterable.

Fixing it:
for i in len(population) -> for i in range(len(population))