nl_tokens: install drivers if needed
pl_tokens: function ( <mask> ) { if ( tunnel || isSeleniumServerRunning ) { return callback ( null ) ; } grunt . log . debug ( 'installing driver if needed' ) ; selenium . install ( options . seleniumInstallOptions , function ( err ) { if ( err ) { return callback ( err ) ; } grunt . log . debug ( 'driver installed' ) ; callback ( null ) ; } ) ; }