pytests need to be rewritten

[angela-li]

Xun and Irene made a few changes to the access code in August (c50cc6e...2598b3e), which are causing 11 unit tests to fail. The unit tests should either be re-written or the code should be reverted to the previous state.

[angela-li]

These are the unit tests that are failing: https://travis-ci.org/GeoDaCenter/spatial_access/builds/568570045