v1: Entity Framework migration

[rasmus]

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[kyle-bradley]

@rasmus I migrated EntityFramework on my fork. Let me know if you are happy with my approach and I'll happily do a PR here. I currently only tested PostgreSql & InMemory so would also need to test out MsSQL & SQLite
kyle-bradley#17

[rasmus]

@kyle-bradley that would be awesome!

[rasmus]

@kyle-bradley would you be interested in opening a PR with your migration of EF for v1?

[rasmus]

Or are the changes I did here on the right track? I'm not a EF user and thus have little to no experience working with it.