* riece-async.el (riece-async-open-network-stream): Locate Ruby

* riece-async.el (riece-async-open-network-stream): Locate Ruby
script file in riece-data-directory.
* riece-toolbar.el (riece-make-toolbar-from-menu): Locate Ruby
script file in riece-data-directory.
* riece-ruby.el (riece-ruby-execute): Locate Ruby script file in
riece-data-directory.
* riece-options.el (riece-data-directory): New user option.