* Ignoring .DS_Store for macOS

* Added Direct Utility Estimation code and fixed notebook

* Added implementation to README.md

* Added section on Hill Climbing

* Added images

* Updated README.md

* Add test for table driven agent

* Some style fixes

* Added done to tabledrivenagent test in readme

* Added randomAgentProgram test to test_agents.py

* Added Import randomAgentProgram

* Style fixes

* Added the done tag tp tabledrivenagent test

* Update README.md

* Add test for TableDrivenVacuumAgent

* Debug Travis

* Minor fix

* Fixed table for TableDrivenAgent

* Update README

* Add SimpleProblemSolvingAgent

* Fix typo in search.py

* Added vacuum_world.ipynb

* Add psource for environment

* added submodule

* removed duplicates

* minor changes

* Update README.md

* removed an unwanted commit

* probability notebook

* Update test_probability.py

* Update README.md

* Update README.md

* Update intro.ipynb

* Added predicate_symbols

* Added FOIL

* Updated README

* Update README.md

* Create nlp_apps.ipynb

* typo in readme

* Update intro.ipynb

* Added tests for search.py

* Updated readme

* Removed extra newline

* Fixed seed

* Update README.md

* Added docstring for minimal-consistent-det

* add tests column

* add finished tests

* add version-space learner + small fix

* add test for version-space learner + trivial example

* Update README.md

* Update README.md

* add powerset to utils

* add powerset test

* Create knowledge.py

* Create test_knowledge.py

* add header docstring to knowledge.py

* update learning docstring

* minor edits in knowledge.py

* 'test_logic.py typo fixed(#425)

* typo 'logic_test.py' fixed(#425)

* Update utils.py

in pseudo code the sequence of arguments is   " WEIGHTED-SAMPLE-WITH-REPLACEMENT(N, S, W)"  

* 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

* Update planning.py

added double_tennis_problem from chapter 11 , figure 11.10

* Update utils.py

added missing space after comma

* Update learning.py

added missing space after comma

* Update probability.py

added missing space after comma

* Update search.py

added missing space after comma

* Update planning.py

* Update planning.py

* Update planning.py

* Update planning.py

* Update planning.py

* Update planning.py

* Update test_agents.py

pep8 changes, showed flake8 errors

* Update test_agents.py

* Update test_agents.py

* Update test_agents.py

* Update test_text.py

added missing whitespace after comma

* Update utils.py

added space after comma

* Update search.py

added space after comma

* Update probability.py

added space after comma

* Update learning.py

added space after comma

* Update planning.py

added double_tennis_problem

* Update rl.py

In the pseudocode figure 21.8, the first 'if' starts with argument 's', which is the previous state, not s1(i.e, the current state).

* Update search.py

the 'uniform_cost_search' in notebook 'search-4e.ipynb' resembles more to the pseudocode in book.

* Update search.py

* Update search.py

* Update search.py

* Update README.md

* Update README.md

* Update README.md

* Update planning.py

* Update planning.py

added spaces after comma

* Update planning.py

* Update test_planning.py

added double_tennis_problem test

* Update test_planning.py

* Update logic.py

added fol_fc_ask from fig 9.3

* Update logic.py

* Update test_planning.py