Use Jekyll collections instead of posts

[jiacona]

Thanks for building this. It has been a great starting point for me. However, one thing that has bugged me is the way everything has to be defined as a post and the extra baggage that involves (timestamps and such).

It turns out it is easy to use Jekyll collections instead of posts, which don't have the required posts detritus. I'd be happy to tidy up my code and submit a pull request converting the templates and config to use collections if you are interested.