Bug #2, Wired in more options in settings admin page

* https://github.com/nfreear/wp-accessify/issues/2
Bug #2, Improve the Accessify site "glue" Javascript, fix exclude users
Bug #3, Use new "accessify-client-php" generic library

* Plus, Bug #2 - improve the options/settings page
* https://github.com/nfreear/accessify-client-php