Revert "Added a test for thread safety of Chronic.parse to test suite"
Revert "Added a test for thread safety of Chronic.parse to test suite"

This reverts commit a9555bce90f829a312d10b383e05d8009234b46c.

CraigCottingham/chronic,davispuh/chronic,copiousfreetime/chronic,mojombo/chronic,lautis/chronic,j-hernandez/chronic