Fix 1322

I'm not sure if the iam user destroy method should be updated to include deleting any policies and access keys first as described [here](http://docs.aws.amazon.com/IAM/latest/UserGuide/Using_DeletingUserFromAccount.html#Using_DeleteUser_APIandCLI), but I didn't want to change the behavior of things just to fix the tests if possible.

I did end up passing path when creating a role, but seems to work fine with the defaults.