code: function getGroup(name, done) {
    return getModels(function(m) {
      return m.collections.group.findOne({ name })
        .populate("members").populate("leaders").exec(done);
    });
  }
docs: Get a group. It populates the members and leaders automatically.
  
  @param {String} name
  @param {Function} done - done(err, group)