Improve registration so the container page can pick what URL it's going to route through to registration.

skins/base/views/pages/MatrixChat.js

@@ -57,6 +57,7 @@ module.exports = React.createClass({
                 <Register onLoggedIn={this.onLoggedIn} clientSecret={this.state.register_client_secret}
                     sessionId={this.state.register_session_id} idSid={this.state.register_id_sid}
                     hsUrl={this.state.register_hs_url} isUrl={this.state.register_is_url}
+                    registrationUrl={this.props.registrationUrl}
                 />
             );
         } else {