lib/api.js
function(identifier, cb) {
    logger.info('list revisions: ' + identifier);
    if (!identifier) {
      return cb(new Error('no identifier'));
    }
    var systemId = _sr.findSystem(identifier);

    if (!systemId) {
      return cb(new Error('system not found'));
    }

    _sr.listRevisions(systemId, function(err, revisions) {
      cb(err, _.first(revisions, 20));
      //cb(err, revisions);
    });
  }
function(identifier, cb) {
    logger.info('list revisions: ' + identifier);
    if (!identifier) {
      return cb(new Error('no identifier'));
    }
    var systemId = _sr.findSystem(identifier);

    if (!systemId) {
      return cb(new Error('system not found'));
    }

    _sr.listRevisions(systemId, function(err, revisions) {
      cb(err, _.first(revisions, 20));
      //cb(err, revisions);
    });
  }
get the revision history for a system