Use start-up project for ConfigureServices

[moozzyk]

I am trying to set up a project where the business logic (including data model) is separated from UI/web. The context has only a ctor that takes only DbContextOptions because I want to use InMemoryStore for tests and SqlServer when actually running the app. I am trying to add a migration from the "engine" project and provide the web project as the start up project since this is where I configure EF to use SqlServer (in the ConfigureServices method). This is on Beta4 bits.

dnx . ef migration add initial -s StarTrader

Information: [LoaderContainer]: Load name=EntityFramework.Relational
Information: [NuGetAssemblyLoader]: Loaded name=EntityFramework.Relational in 3ms
System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.Data.Entity.Commands.Program.GetProjectPath(String projectName)
   at Microsoft.Data.Entity.Commands.Program.ExecuteInDirectory(String startupProject, Func`1 invoke)
   at Microsoft.Data.Entity.Commands.Program.AddMigration(String name, String context, String startupProject)
   at Microsoft.Data.Entity.Commands.Program.<>c__DisplayClass7_1.<Main>b__6()
   at Microsoft.Framework.Runtime.Common.CommandLine.CommandLineApplication.Execute(String[] args)
   at Microsoft.Data.Entity.Commands.Program.Main(String[] args)

There is a recent change that touched this code so it might be already fixed in beta5

[bricelam]

The start-up project still isn't used for ConfigureServices. This work is part of #639