code: function getAllGroups(connections, options, cb) {
    var conn = connections.mongooseConnection;
    var groupsModel = models.get(conn, models.MODELNAMES.GROUPS);
    groupsModel.find().exec(function(err, groupsList) {
      if (err) {
        return cb(err);
      }
      return cb(null, groupsList || []); // Note: purposely returning empty array here for now, maybe this should be null instead?
    });
  }
docs: /*
  getAllGroups(connections, options, cb)
  
  connections: {
  mongooseConnection: ...
  }
  
  options: {
  uri:       db connection string,
  userEmail: user email address string
  }
  
  cb  - callback function (err)