Style: delete excess parentheses. In some of these cases you need to read ahead to see that the paren is not introducing a tuple, for example.

* Replaced mean with standard lib function introduced in 3.4

* #TODO Replaced every with all

* Proper names for variables introduced in 2to3 conversion.

* fixes an error in search.py

* modifies the method name 'exec' which is a built-in name

* adds table for Figures of implemented data structures

* fixed a small typo

* modifies Fig. to Figure all over the repository

* fixed a small type in logic.py

* Change variable names from s_prime to s1, current_state to s1

* Sane default for update_state

Following a suggestion by C.G.Vedant, changed |implies| to |’==>’|

* Implemented QLearningAgent

* Added QLearningAgent in Index

* Error message of python errors

* Added Canvas_TicTacToe class

* Added TicTacToe to notebook

* Added games.ipynb

* moved js file to js folder

* removes obsolete Fig dictionary from utils.py

* modified rl notebook according to the new Figure conventions

* removes 'import Fig' and changed the names of Figures

* fixes a small error (by me) in executing the cells in rl notebook

*  Used isclose from utils to maintain compatibilty for 3.4

* Removed redundant distancesquared function

* Removed duplicate definition of clip in grid.py and used import from instead.

* Fixed spelling typo