Get test data as dictionary

[ZeddzZ]

I found this library pretty useful and interesting, thanks for that!
But for my project I want to migrate tests from MSTest to nUnit and the problem was to add TFS support with minor changes of tests code.
That is why I decided to add possibility to receive test data as dictionary (ms test has attribute

[DataSource(DATA_SOURCE, TFS_TRACKER_URL, TEST_CASE_ID", DataAccessMethod.Sequential)]

and code part

var username = TestContext.DataRow["user"].ToString();

), so dictionary allows to follow this code style even if it must be added as test param.