Additional testcases

It turns out that Determinant task should contain a couple more tests like this

checkio([[0,1], [0,2]])

checkio([[0,1,1], [0,2,1], [1,1,1]])

since my first solution is complete the task, but fail on this tests http://www.checkio.org/mission/determinant/publications/gmixo/python-27/matrix-conversion/