- Added APIs to retrieve an `ITextBuffer` from a `Document` and to retrieve a `RazorCodeDocument` from an `ITextBuffer`.
- The `RazorCodeDocument` from `ITextBuffer` API supports both the new and old Razor parsers so we can transition seamlessly between the two.
- Added logic in the `RazorDirectiveCompletionProvider` to consume descriptions from `DirectiveDescriptor`s. This is then surfaced via tooltips.
- Retrieved currently active `RazorCodeDocument` given a Roslyn buffer and harvested all directives to display in the completion list.
- Added unit tests to validate each new services functionality.
#291
N. Taylor Mullen