All form-element components expect to be controlled components. This makes them
immediately compatible with form managers like formik or redux-form, as well as
within any stateful component.

Use the `<CurrencyInput />` component just as you would for any `input` type that
accepts textual input (`radio`, `checkbox` have their own respective
components). All props get passed on to the underlying `input`.

In addition to native form element attributes, all form-element components
implement these props

isInvalid: Boolean -- Indicates whether the value of the field is valid
(`false`) or invalid (`true`)

```
<CurrencyInput
  name="my-input"
  required
  isInvalid={this.state['my-input'].isInvalid}
  onChange={this.handleChange} // `value` and `formattedValue` are available in `values` obj, can use like : const {value, formattedValue} = values
  value={this.state['my-input'].value}
/>
```

TODO: Add some standardized onClick tracking?