update to use Fsharp.Compiler.Service 0.0.7

Here are the changes to update to use FSharp.Compiler.Service. This flushed out a few bugs which are fixed in 0.0.7 of FCS.

The generator still only works with .NET 4.x - the FSharp.Core resolves automatically, as does mscorlib.  However it should work with any valid F# compilation arguments if the arguments used are adjusted here: src/FSharp.MetadataFormat/Main.fs

I'm having some trouble running unit tests, I've tested most things in Tests.*, still looking into that.