Unnecessary include of entity framework in nuget package

[antidemon]

As far as I can see from the source download from http://www.albahari.com/nutshell/LinqKitSource.zip there is no need for the nuget package to include entity framework apart from for the demo project. Can we remove this dependency from the nuget package please.

[Thorium]

Source code on www.albahari.com is quite old. Since then we had to support async queries. And for that we need the interfaces from EF:
IDbAsyncEnumerator<T> and IDbAsyncEnumerable<T>

So after this commit there has been this dependency:
890bccc

The old .NET 3.5 version actually wouldn't need EF, so this is removed from the LinqKit.Net35 solution. #18

Is that ok..?

[Thorium]

Now you can get also the 3.5 version from the NuGet package, from version LinqKit 1.1.3