changes 'New post' from link to navbar button inside a #nav-top div
changes submit button class from btn-default to btn-success
moves the publication of comments from the initial app load to a more efficient postShow route, preloading within the waitOn function. The comments publication returns comments from the given post only. This means we don't have to publish all comments from all posts on app load, but in a post to post basis :)
denormalizes commentsCount helper into an attribute for each post, removes the commentsCount helper, adds the commentsCount attribute when creating the posst (initialized with 0), when creating a comment the parent post's commentsCount is incremented by 1
adds commentsCount attribute initialized to 0 to each inserted post (except the first one, because we are inserting 2 comments to it)