Commented Issue: OData actions do not work if the model has KeyValuePair. [1232]

1) Create a model having an ODataAction.
2) Add a complex type KeyValuePair<string, object> to the model like this,
model.ComplexType<KeyValuePair<string, object>>();


3) Try accessing that action. ODataFormatter fails with model state error,

```
{Microsoft.Data.OData.ODataException: A top-level property with name 'IsUser' was found in the payload; however, property and collection payloads must always have a top-level property with name 'value'.
```

This is because ODataActionParameters is IDictionary<string, object> which is IEnumerable<KeyValuePair<string, object>>. So ODataFormatter thinks that ODataActionParameters is a EDM collection type.
Comments: [Fixed](https://aspnetwebstack.codeplex.com/SourceControl/changeset/74b3c6c6a6bd3ba76aa2af0d1a740d4e51d9f9dc)