- #3227
- much of change is to tests, creating and passing `ModelMetadata`
- updated `InputFormatterContext` to make `ModelMetadata` available to `JsonInputFormatter`
- walk `ModelMetadata` tree to get information about property with an issue
- add missing `null` checks in `ModelStateDictionaryExtensions`
- remove useless `configuration` variables and `Configuration` instances
- remove "Review" code comment
- unintentionally included in commit 4b5dd19
- reduce repeated code in `TestHelper` for functional tests
- `CreateServer()` methods had duplicate code, an ambiguous match, and an odd order
- rename `GetTestConfiguration()` to `UseCultureReplacer()` in functional tests
- correct typo in 3303286288
- really seal `CachedModelMetadata.Properties`
- make a couple of test methods `public` (!!)
- add Microsoft.AspNet.PageExecutionInstrumentation to Mvc.sln
- remove `<RootNamespace/>`, `<ProjectExtensions/>`, etc. from .kproj files