Revert "fix logs and tests for #56"

This reverts commit df49fb84c1670fa629f69340d32a0dbafb8ee421.
Revert "Make 404 responses compatible with CouchDB API"

This reverts commit dabf5e1c9a7e53f435b89d9e0fbf8e091e7e40e8.

See discussion in #57
making latest tag behaviour configurable