Adding support for required array from http://tools.ietf.org/html/draft-...

[dmcfarland]

Adding support for required array from http://tools.ietf.org/html/draft-fge-json-schema-validation-00#section-5.4.3

As described under #323

In json_schema v4, the idiomatic way to do required properties is with a required array at the end of the object:

{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "$ref": "#/definitions/abc",
  "id": "resource:///json_schema/match/abc.json#",
  "definitions": {
    "abc": {
      "type": "object",
      "properties": {
        "name": {
          "type": "string"
        },
        "age": {
          "type": "string"
        }
      },
      "required": ["name", "age"]
    }
  }
}

[joelittlejohn]

Hi David. Thanks a lot for tackling this, a lot of people will find it useful.

The one thing we need before I can merge this is an integration test to cover this feature. Hopefully you can use the current RequiredIT for an example of how to write these. There are helpers to generate and compile code during the test so they're quite straight forward to write.

[dmcfarland]

Thanks for pointing out the missing integration test. Hopefully should be committed now.

[tylerprete]

@dmcfarland Thanks for implementing this!