Adding @using in _GlobalImports shows squigglies in VS

I have the following in _GlobalImports.cshtml

``` C#
@using NoAut
@using Microsoft.Framework.OptionsModel
@addTagHelper "*, Microsoft.AspNet.Mvc.TagHelpers"
```

In my View I am using it as 

``` C#
@inject IOptions<AppSettings> AppSettings
```

In VS I get squiggles in my Views. It works at runtime. Chatted with Taylor and he will look into this
