code: public JenkinsServer createView(String viewName, String viewXml, Boolean crumbFlag) throws IOException {
          return createView(null, viewName, viewXml, crumbFlag);
      }
docs: Create a view on the server using the provided xml.
  
  @param viewName name of the view to be created.
  @param viewXml The configuration for the view.
  @param crumbFlag <code>true</code> to add <b>crumbIssuer</b>
  <code>false</code> otherwise.
  @throws IOException in case of an error.