Using the "vNext" ASP.NET Framework 5 and EntityFramework in Visual Studio 2015RC

As per the question I asked on StackOverflow here:

http://stackoverflow.com/questions/30851344/how-can-i-do-an-entity-framework-migration-with-visual-studio-2015-nuget-prompt

It seems to me that how Entity Framework Code First Migration works is still a large mystery in Visual Studio 2015, with ASP.NET MVC.  The old Entity Framework commands that used to be used in the nUget console window are gone, and the replacement is not clear.  I have a workaround coded in the question above involving me making a batch file called ef.cmd that makes bringing dnx.exe into the path of the nuget console, and then running "dnx.exe . ef ...." commands at least remotely possible.

Anyone know how you're really supposed to use the EF command, with vNext?

Warren in Toronto