code: function SamlIdpUrlBuilder(application) {
    this.application = application;
    this.apiKey = application.dataStore.requestExecutor.options.client.apiKey;
  }
docs: Creates a URL builder that can build SAML IDP redirect URLs.  This is done
  when Stormpath is initiating a redirect to a SAML IDP.
  For more information, please see
  [Authenticating Against a SAML Directory](http://docs.stormpath.com/rest/product-guide/latest/auth_n.html#authenticating-against-a-saml-directory).
  
  This authenticator is bound to the application that you pass to the constructor.
  
  @class
  
  @param {Application} application
  
  The Stormpath Application that will issue the redirect. This application must
  be mapped to the relevant SAML Directories.
  
  @example
  
  var builder = new stormpath.SamlIdpUrlBuilder(application);