message: added header-text configuration property
diff: @@ -523,6 +523,9 @@ export class ConfigurationView {
  if (key === 'resolved-directive') {
  return this.resolveDirectives();
  }
  + if (<any>key === 'header-text') {
  + return this.HeaderText;
  + }
  let result = <any>this.config;
  for (const keyPart of key.split('.')) {
  result = result[keyPart];
  