Add &until=now to frame url query strings missing until parameter.

Missing this parameter broke setting frame end time via query string, e.g. http://promdash/web-status#?range=30m&until=2014-09-24T17:53:52.223Z

addresses #192 
Ah, right, it's not about the browser's URL, but the originally entered frame URL. Still, the code that adds the default should only live in the `if ($scope.frame.graphite) {` block below, right?