code: function cleanIdentity(identity) {
    var userPackage = {};
    Object.keys(identity).forEach(function (key) {
      if (key.indexOf('BRIGHTSOCKET:') !== 0) {
        userPackage[key] = identity[key];
      }
    });
    return userPackage;
  }
docs: Takes an incoming identity package and strips out keys
  that were inserted by Brightsocket.
  
  @param  {Object} identity  - Came in from the IDENTIFY action.
  
  @return {Object} The clean object.