- Updated all implementations of `IImportProjectFeature`; for MVC I went ahead and made a single project item that's always returned for MVC scenarios. That project item is smart about returning its content in a light-weight stream fashion.
- Had to add a `RazorProjectItem` => `RazorSourceDocument` conversion mechanic into `DefaultRazorProjectEngine`.
- Added tests for `DefaultRazorProjectItem.ConvertToSourceDocument`.
- Removed the `ProjectEngine` API from `VisualStudioRazorParser`. This was unrelated but was missed feedback.
#2068
N. Taylor Mullen