`containsAtLeastValues` for column assertions

[uhensler]

Today we can assert that a column has exactly some values :

assertThat(table).column("name").containsValues("Hewson",
                                                "Evans",
                                                "Clayton",
                                                "Mullen");

If the table contains more rows / values, the assertion fails.

But it would be nice to have more flexibility and check if the column contains at least the given values.

[regis1512]

It is a good idea. Thanks.