Generate absolute link for include_code

[floriancargoet]

Here are the relevant lines of my config:

permalink: :year/:month/:title/
code_dir: projects/
source_dir: source

An URL for a post is for instance /2014/03/monthofcode-day-8-mathematics/

If I use the include_code tag :

{% include_code monthofcode/8/8.js %}

the generated download link is projects/monthofcode/8/8.js which is resolved to /2014/03/monthofcode-day-8-mathematics/projects/monthofcode/8/8.js instead of the desired /projects/monthofcode/8/8.js.

Since the code_dir option is relative the the source_dir, I don't see why we shouldn't use an absolute link (starting with a slash).

What do you think?

[smmoosavi]

you must include root config in generated url. see #928