Adapt policy check so that alternative valid policies check out.
Homework 4.5 tests
Integrated tests for homework 3
Corrected minor error (typo) in test_dataset3 and test_dataset4.
…cted_p should be expected_P.
Makes use of assertArraysAlmostEqual
The method is similar to array failUnlessAlmostEqual method of TestCase class from UnitTest library. The code works with both Python 2.6 and 2.7