Enable all region tests

My first commit!  Feel free to be critical of any silliness so i can learn what I'm doing wrong.

All this does is replace the static DFW region in the acceptance tests with the first region in the list of regions associated with an account. As my account is UK based the tests were failing so I figured that is a good first fix.

I added Regions() to the AccessProvider() interface.  If this isn't the best place to do this let me know.