Include fractions of a second. Fix issue #19

[Holek]

No description provided.

[mogox]

It'd be great to have a test for this one but 👍

[tagliala]

I came up with this test

    datetime_with_milliseconds = DateTime.now.strftime('%L')
    expect( lambda {
      Timeout::timeout(1) do
        while DateTime.now.strftime('%L') == datetime_with_milliseconds do; ; end;
      end
    }).to_not raise_error

Is this gem still maintained? I'm going to submit a huge pull request