Add support for RAML overlays #33
Description
We currently don't support parsing of RAML overlays (https://github.com/raml-org/raml-spec/blob/master/versions/raml-10/raml-10.md/#overlays).
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We currently don't support parsing of RAML overlays (https://github.com/raml-org/raml-spec/blob/master/versions/raml-10/raml-10.md/#overlays).