Pattern (and other?) validation doesnt work when referenced via $ref

This was raised by @imthedoctor in discussion in #9

"definitions": {
    "PatternObject": {
      "type": "object",
      "properties": {
        "patternByRef": {
          "$ref": "#/definitions/Pattern"
        },
        "patternInline": {
          "type": "string",
          "pattern": "b+a"
        }
      }
    },
    "Pattern": {
      "type": "string",
      "pattern": "a+b"
    }
  }

Both pattern validations incorrectly passing for requests with invalid fields, e.g.

{
  "patternInline": "foo",
  "patternByRef": "bar"
}

Initial thought is the schema validator may not be following multiple levels of $ref redirection and so isn't generating the appropriate validation messages.

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