Client.scala

def crawlProjectRepos(project: String) = {
    Logger.info("crawling " + project + " by API")
    // a list of Futures containing a Tuple2 of a repository name and a Future[WSResponse]
    val repoList = reposFor(project).map { repo =>
        (repo, callApi(buildCommitUrl(project, repo)))
    }
    Logger.debug("REPOS FOR" + reposFor(project))

    Future.traverse(repoList) (
        repoCommits =>
          repoCommits._2.filter(_.status==200).map { res =>
            (res.json \ "values").as[List[JsValue]].map { c =>
            Commit(0,
              (c \ "id").as[String],
              (c \ "message").as[String],
              (c \ "author" \ "name").as[String],
              (c \ "author" \ "emailAddress").as[String],
              (c \ "authorTimestamp").as[Option[DateTime]](Reads.optionWithNull(jodaDateReads("yyyy-MM-dd'T'HH:mm:ss'Z"))),
              repoCommits._1,
              Option(new DateTime),
              Option(new DateTime)
            )}
        }).map(_.flatten)

 }