improve polyfill config
improve polyfill config

tomascassidy/webshim,fashionsun/webshim,webdev1001/webshim,pablogrela/webshim,ilovezy/webshim,aFarkas/webshim,tomascassidy/webshim,tomascassidy/webshim,aFarkas/webshim,cl4rke/webshim,ilovezy/webshim,webdev1001/webshim,cl4rke/webshim,webdev1001/webshim,pablogrela/webshim,aFarkas/webshim,cl4rke/webshim,pablogrela/webshim,ilovezy/webshim,fashionsun/webshim,fashionsun/webshim