Augmented the postsList to take a limit.
Refactored postsList in to a RouteController.
Added nextPath() to the controller and use it to step through posts.
Use the iron-router-progress package to make pagination nicer.
Use a single post subscription to ensure that we can always see the right post.
As per https://github.com/DiscoverMeteor/Microscope/issues/92
Added basic upvoting algorithm.