aspnet/Mvc — pull request #1209 by dougbu (2014-10-01 05:22:34+00:00)
Title: [Design] Calculate `ModelMetadata.DataTypeName` based on metadata

- helps MVC helpers like `@Html.EditorFor()` select the correct template
- #933

nit:
- add XML doc for `DataTypeName` in base `ModelMetadata`
- an -> a in an adjacent XML comment in `CachedDataAnnotationsModelMetadata`