Audit_each was missing path argument when calling logs.

This commit fixes the current crash in Sufia. We should eventually update this method to use a version object rather than parsing the version information out of the URI. We'll do that once the version object PR has been completed in Active Fedora

Fixes bug #749
Merge pull request #751 from projecthydra/audit_each_bug

Audit_each was missing path argument when calling logs.