Basic update for blaze support

Hey, I'm just getting Discover Meteor ready for the imminent Blaze (Meteor UI / Shark) release.

Iron Router also is getting ready for a similar release. I think the only way it directly affects this package is that `this.stop()` has been replaced by `pause()`. I've made the obvious change in the `before` filter you setup, but I guess there's a more subtle one in the way you override `this.stop()`. I'm not sure what the best approach is there.

P.S. Have you considered calling `Router.before(..)` etc, rather than writing in a `before` filter for every route?