1.0.63 - when admin self-removal fails, nothing should break

* ensure that after an admin user fails to disassociate, that user's
  access still works as it should.
* ensure before/after in these tests are :each so that we start each one
  in a known clean state.
Merge pull request #77 from opscode/mp/verify-remove-user-fails-safely

when admin self-removal fails, nothing should break