line numbers are not visible and shareable

[ssbarnea]

--markup-lines option should make line numbers visible and clickable, just like travis. This would allow users to share bookmarks pointing to specific line.

I also think that the bookmark name should be as short at possible in order to avoid increasing the size of the generated document, if possible just the line number, if not prefixed by a capital L.

Bookmarks should look like: http://example.com/my.log#123 or http://example.com/my.log#L123