万门大学，强化学习，Grid_world_evaluation模型算法代码实现，
V(S) = V(S) + A * ( R(S) + r*V(new_S) - V(S)　)

Grid_world_Policy模型，
P(S) = P(S) + A * ( R(S) + r*P(new_S) - P(S)　)(In the intensive learning of the University of Wan men, the Grid_world_evaluation algorithm, the python implementation, the algorithm formula are as follows.

V(S) = V(S) + A * ( R(S) + r*V(new_S) - V(S)　)

the Grid_world_Policy algorithm.
P(S) = P(S) + A * ( R(S) + r*P(new_S) - P(S)　))