* Added SATPlan to logic.ipynb

* Updated README.md

* A few helper functions

* Added Simulated Annealing

* Updated README.md

* Updated README.md

* Added function to plot NQueensProblem

* Added queen image

* Changed plotting function for NQueensCSP

* Replaced f'{}' with .format() notation

* Added Pillow to travis.yml

* Added air_cargo to planning.ipynb

* Some style issues

* Added test for simpleReflexAgent

* Fixed a bug

* Fixed another bug

* Added dpll section

* Updated README.md

* Added WalkSAT section

* Updated README.md

* added tt-entails explanation

* Updated README.md

* 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)