Added object properties ordering to uiSchema.

[n1k0]

Object fields ordering

The uiSchema object spec also allows you to define in which order a given object field properties should be rendered using the order property:

const schema = {
  type: "object",
  properties: {
    foo: {type: "string"},
    bar: {type: "string"}
  }
};

const uiSchema = {
  order: ["bar", "foo"]
};

render((
  <Form schema={schema}
        uiSchema={uiSchema} />
), document.getElementById("app"));

[n1k0]

Bah, I realize you then can't use an object field named order. I'll come with another name, eg. ui:order.

[n1k0]

Much better. Also, I'll have to rename widget to ui:widget as well for the same reason. I'll do that in a next PR.

Edit: opened #30

[almet]

Cool :')