* Added Policy Iteration section

* Removed ambiguous test

* Capitalized header

* Added images

* Added section for sequential decision problems

* added overview for AdaBoost

* added implementation for AdaBoost

* added example for AdaBoost

* added tests for AdaBoost

* rephrased sentences

* final changes to AdaBoost

* changed adaboost tests to use grade_learner

* grammar check

* Add SimpleProblemSolvingAgent

* Fix typo in search.py

* Added vacuum_world.ipynb

* Add psource for environment

* added submodule

* fixed ac3 in csp.py

* added a test to verify the modified ac3 algorithm in csp.py

* Update .gitmodules

* Added GridMDP editor to create and solve grid-world problems

* Added reference to grid_mdp.py in mdp.ipynb

* Replacing %psource with psource function

* Print matrix to console as well

* added submodule

* removed duplicates

* minor changes

* Update README.md

* removed an unwanted commit

* Added dropdown option to solve using genetic algorithm

* Added option to solve using Hill Climbing

* Added messagebox to confirm exit

* added Best First search

* fixed minor conflicts

* minor changes

* Added explanation of Genetic Algorithm functions using an example

* Added GUI version of genetic algorithm example (phrase generation problem)

* rebase with master

* solve error

* solve error

* solve error

* Update search.ipynb

Add features like selecting cities to be part of tsp, controlling temperature and speed of
animation.

* Update PeakFindingProblem code to allow diagonal motion

* Fix unit test issues

* update PeakFindingProblem to take actions as input param

* Refactor code in search.py

* Added Vacuum Agent

* Minor Fix

* Improved Font

* Added XYVacuumEnv

* Minor Fix

* Review changes

* added example for Decision Tree Learner

* fixed docstring in learning.py and description in learning.ipynb

Partially solves #687

* tic-tac-toe gui added

* Added GUI for Searching

* Added Legend and Minor Fix

* Minor Fix and Options added

* Added Breadth-First Tree Search

* Added Depth-First Tree Search

* Minor Fix

* Added Depth-First Graph Search

* Minor Fix

* Breadth-First Search and Minor Fix

* Added Depth-First Graph Search in notebook

* Added Depth-First Tree Search in notebook

* Cell Placement

* Added Uniform Cost Search in GUI

* tic-tac-toe gui added

* Added GUI for Searching

* Added Legend and Minor Fix

* Minor Fix and Options added

* Added Breadth-First Tree Search

* Added Depth-First Tree Search

* Minor Fix

* Added Depth-First Graph Search

* Minor Fix

* Breadth-First Search and Minor Fix

* Added Depth-First Graph Search in notebook

* Added Depth-First Tree Search in notebook

* Cell Placement

Closes #673

* tic-tac-toe gui added

* Added GUI for Searching

* Added Legend and Minor Fix

* Minor Fix and Options added

* Added Breadth-First Tree Search

* Added Depth-First Tree Search

* Minor Fix

* Added Depth-First Graph Search

* fixed Key Error bug in CustomMDP and reordered the return values of T function to be consistent with GridMDP

* removing idea files from git

* probability notebook

* Update test_probability.py

* Update README.md