randym/axlsx — pull request #147 by raiis (2012-11-26 19:25:18+00:00)
Title: Different left/right border style

Here you go, take a look at my pull request.
I updated source and example source, so it could be easily tested.

If specific edge isn't specified, then :border_[name] don't override it. Style and/or color can be overridden individually.