How to generate Entity Framework 6.x POCO classes with mappings from an EDMX file?

I'm in the process of converting an extensive EDMX model into POCO classes. I need to go from a Database First approach (EDMX with ObjectContext) to a pure Model First approach (DbContext with no EDMX file). I need to use the latest Entity Framework stable version: 6.1.1. I'm in the process of converting an extensive E