Example does no validate properly when included

```yaml
#%RAML 1.0
title: My Sample API

types:
  SomeType:
    type: object
    properties:
      a: string
      b: integer
    examples: !include example.raml
```

example.raml

```yaml
#%RAML 1.0 NamedExample

value:
  a: blabla
  b: 111
```

This does not validate.

Aha! Link: https://mulesoft-roadmap.aha.io/features/APIRAML-37