Added Advapi32Util accessCheck method to verify file permissions

I had contacted you on the Google Group about adding this functionality to check effective file permissions for the current user.
I've added three tests to verify the positive cases.
I couldn't think of an automated way to test the negative cases so I just manually tested those and deleted the tests for those.
Let me know if you have any questions.
Can you message me back on the Google Group when you have Maven Central updated with a new release with these changes?

Shawn