Clean up FSharp.CompilerBinding agent API

[rneatherway]

Comment in FSharp.AutoComplete/Program.fs:

// TODO: Clean up the API these options are being generated to call
//
// That API is in FSharp.CompilerBinding.LanguageService.
// 1. It expects a Target Framework, but only for FSI as
// FCS is rumoured not to return references including FSharp.Core
// and it uses the framework to guess where it is.
// We will just use 4.5.
// 2. The CompileFiles just get added to the options, so we will do that
// here and then pass in an empty array of CompileFiles.

Any changes will also affect monodevelop binding.

[7sharp9]

Is this now complete then?

[7sharp9]

I removed the XS label as this is no longer an issue there as its "evolving"

[rneatherway]

This issue was moved to ionide/FsAutoComplete#17