Support for relative urls #53
                
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Hi, I love your work on htmlpreview. Great stuff.
I was struggling with links from markdown repositories to html files in the same repository, as I did not find a way to make them relative to the revision.
So in this pull request I added url rewriting to support linking to html files relative to .md
documentation in the same repository of a specific revision.
There is one implication that htmlpreview.github.io will need to be hosted on https, but using caddy that should not be a problem.