Provide option to use ScalaDoc comments in Docco

[vjpr]

I have an existing codebase with ScalaDoc comments. It would be great to have a setting to use existing ScalaDoc comments when generating Docco. Having two sets of comment notation in code is a bit confusing if you are working with a team.

Projects like Docco-Husky parse the ScalaDoc/JavaDoc using Dox which provides a JSON object of JavaDoc information, which it can then render along with the Docco comments.