2.0.1

This is a bugfix release addressing a bug introduced in 2.0.0 that causes
intermittent segmentation faults.

Corrected cases where we simply returned the target JSON as an
operation result. A result should always be a freshly created JSON
struct so that the caller knows how to free it.

Added checks to free rods_path.rodsObjStat consistently. Although
valgrind didn't find errors with the existing checks, they were not
applied consistently.