Added comments collection, pub/sub and fixtures.
Displays comments on postPage
Created a form to submit comments
Made a simple publication/subscription for comments
Denormalized the number of comments into the post.
Added basic notifications collection.
Display notifications in the header.
Only sync notifications that are relevant to the user.
Added enough posts that pagination is necessary.
Added paginated subscription package, and ordered post by submitted date.
Use the paginated subscription to step through posts.
Use a single post subscription to ensure that we can always see the right post.