Fix failing travis CI OSX test failures (#1767)
Fix failing travis CI OSX test failures (#1767)

* Limit pytest to before 5.3.0 to debug failing test on OSX

* Force pluggy to greater than 0.13

* Add 5% wiggle room to test_axis rotation check

* Remove pluggy from travis deps

Eric89GXL/vispy,Eric89GXL/vispy,Eric89GXL/vispy