Let Org-mode babel file result support relative (adaptive) link type by
using `org-link-file-path-type`.

This also can solve static site generator extensions (like `ob-blog.el`
etc) image link path issue.

Also better if user changed parent directory name, those links will have to
updated too. But if `adaptive` `org-link-file-path-type` will solve this
problem.

So please let Org-mode babel header arguments `:results file :file
"filename.png"` use `org-link-file-path-type` variable.

[stardiviner]           <Hack this world!>      GPG key ID: 47C32433
IRC(freeenode): stardiviner                     Twitter:  @numbchild
Key fingerprint = 9BAA 92BC CDDD B9EF 3B36  CB99 B8C4 B8E5 47C3 2433
Blog: http://stardiviner.github.io/