Move to latest released liberator.

This is a build of the 0.12.1 tag in liberator upstream repo.

However, The clojars jar is corrupt so we build our own.

See https://github.com/clojure-liberator/liberator/issues/162
Add Downloads to property overview and profiles.
use common fn for representation override.
remove logging.
Merge pull request #303 from MastodonC/feature/property-profile-csv-download

property / profile csv download