Revert "Small value_iteration improvement"

This reverts commit 88fc2433b43d7c4c7ab969b879999ae7562c0da9.
Improved indentation in policy_iteration

Improved indentation in policy_iteration for readability
Changed name of policy_evaluation to iterative_policy_evaluation as
there seems to be a difference
Added comments
Added information to "Converged!" prints so we know exactly which
function has converged