Move OnManagerLoginFormRender event and set manager template HTML source to $modx->config().
Login template contents use $modx->output(Unuse $modx->config['manager_login_tpl']).
Merge pull request #43 from soushi/move_OnManagerLoginFormRender

OnManagerLoginFormRenderイベントの移動とログイン画面テンプレートを$modx->config()に保存