CORE-3924: migrated to clj-http version 0.6.3
CORE-3924: migrated to Apache HTTP Client version 4.2.2
CORE-3929: began migrating to cheshire
CORE-3929: added a few unit tests for clojure-commons.provenance
CORE-3929: added a log4j configuration file to use for testing
CORE-3929: migrated clojure-commons.riak and removed some obsolete comments
CORE-3929: ensure that the request body can be passed to cheshire/decode-stream in body->json