Test failures with numpy 1.14.0 #232

________________________________ test_validate _________________________________

    def test_validate():
        assert validate(int, 1)
>       assert validate('int', 1)
E       AssertionError: assert False
E        +  where False = validate('int', 1)

datashape/tests/test_user.py:8: AssertionError
___________________________ test_nested_iteratables ____________________________

    def test_nested_iteratables():
>       assert validate('2 * 3 * int', [(1, 2, 3), (4, 5, 6)])
E       AssertionError: assert False
E        +  where False = validate('2 * 3 * int', [(1, 2, 3), (4, 5, 6)])

datashape/tests/test_user.py:19: AssertionError
_____________________________ test_validate_dicts ______________________________

    def test_validate_dicts():
>       assert validate('{x: int, y: int}', {'x': 1, 'y': 2})
E       AssertionError: assert False
E        +  where False = validate('{x: int, y: int}', {'x': 1, 'y': 2})

datashape/tests/test_user.py:26: AssertionError
________________________ test_tuples_can_be_records_too ________________________

    def test_tuples_can_be_records_too():
>       assert validate('{x: int, y: real}', (1, 2.0))
E       AssertionError: assert False
E        +  where False = validate('{x: int, y: real}', (1, 2.0))

datashape/tests/test_user.py:36: AssertionError