Updated Gay-Berne unit test to use tree neighbor list
Updated Gay-Berne unit test to use tree neighbor list

This is because the "plain" N^2 neighbor list computation was removed.

joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue