Resolve from NuGet doesn't work

**Version Used**: 
Version 15.8.0 Preview 2.0 [27716.1.d15.8]

**Steps to Reproduce**:

1. 
```
    class Program
    {
        static void Main(string[] args)
        {
            JObject foo; // <-- CTRL+. on JObject
        }
    }
```
**Expected Behavior**:
To be able to resolve from NuGet

**Actual Behavior**:
Unable to resolve from NuGet.
