Python algorithm migration

Currently AIMA is transferring from the 3rd to the 4th edition, thus some algorithms are removed, updated or added. To support the release of newest edition of AIMA, some of the original Python instances need to be altered to fit the changes in book. Currently the repo 'aima-Python' records all the algorithms in the 3rd edition but not updated for the 4th yet. What needs to be done is to check differences between the third edition and fourth edition pseudocode, provide python examples, test cases, demos and documents for the altered parts. If possible, some visualization methods such as animation will make the algorithms clearer.