message: Optional redirect with signUserOut
  Resolves
diff: @@ -160,7 +160,10 @@ export function loadUserData() {
  * @param {String} [redirectURL='/'] Location to redirect user to after sign out.
  * @return {void}
  */
  -export function signUserOut(redirectURL: string = '/') {
  +export function signUserOut(redirectURL: string = null) {
  window.localStorage.removeItem(BLOCKSTACK_STORAGE_LABEL)
  +
  + if (redirectURL != null){
  window.location = redirectURL
  }
  +}
  