message: now possible to remove a user from a wallet
  Reviewers: benchan, andrew
  Subscribers: ben
diff: @@ -363,6 +363,24 @@ Wallet.prototype.shareWallet = function(params, callback) {
  .nodeify(callback);
  };
  +/**
  + * Remove user from wallet
  + * @param params
  + * - userId Id of the user to remove
  + * @param callback
  + * @return {*}
  + */
  +Wallet.prototype.removeUser = function(params, callback) {
  + params = params || {};
  + common.validateParams(params, ['userId'], [], callback);
  +
  + var userId = params.userId;
  +
  + return this.bitgo.del(this.url('/user/' + userId))
  + .result()
  + .nodeify(callback);
  +};
  +
  /**
  *
  * @param params
  