Adopt standards from Jekyll and keep it compatible

[ramnathv]

Posts

I can use the idea of permalinks to parse post names. E.g. a post named 2013_08_08_post.Rmd will be compiled to the html file 2013\08\post\index.html. This requires three steps

1. Constructing the path to the compiled html.
2. Creating the required directory structure if not already present.
3. Compiling only if update is really required.