added github markdown css port
added github markdown css port

codePile-Commit/EpicEditor,Mignet/EpicEditor,devlinjd/EpicEditor,chenhengjie123/EpicEditor,cesarmarinhorj/EpicEditor,Mignet/EpicEditor,chenhengjie123/EpicEditor,hacksalot/EpicEditor,hacksalot/EpicEditor,OscarGodson/EpicEditor,OscarGodson/EpicEditor,devlinjd/EpicEditor,cesarmarinhorj/EpicEditor,codePile-Commit/EpicEditor