Log Message:
Update to 2.15. From the changelog:

Explictly export empty string w/ scalar export if no lib's found
to avoid undefined variable errors in caller.

Added test for explicitly looking up non-existant directory and
exporting it as a scalar.

Test cleanups.

Minor refactoring: Return immediately from import if no lib's are found.

Minor comment and POD issues.

Patch old version, thanks to Dominic Humphries.

Use v5.14 in new version.