feat(radio): support ngModel on md-radio-group

[doctorrustynelson]

• Added support for ngModel on md-radio-group
• Updated Documentation
• Added Demo App Example

[doctorrustynelson]

This should fix #208 that I submitted earlier.

[jelbourn]

Why are you removing the event object?

[doctorrustynelson]

I changed the type of the event from the MdRadioChange to just the value of the radio button because I found that if I didn't the ngModel I would bind to would get an MdRadioChange event as it's value instead of the intended value. The changes related to this line up with similar code that I saw in the MdCheckbox implementation which I used as a reference for most of my changes.

[jelbourn]

We should keep the event object (checkbox should also have one eventually), and make it so that you just call the fn argument with the value extracted from the event object:

registerOnChange(fn: any) {
  if (this._changeSubscription) {
    this._changeSubscription.unsubscribe();
  }
  this._changeSubscription = <{unsubscribe: () => any}>this.change.subscribe(changeEvent => {
    fn(changeEvent.value);
  });
}

[doctorrustynelson]

I have re-included the MdRadioChange event as requested.

[jelbourn]

Changes seem good, just needs unit tests now.

[doctorrustynelson]

I have cleaned up the code as suggested and added a unit test.

[jelbourn]

Looks like this added behavior also needs a test.

[jelbourn]

LGTM aside from one more unit test.

cc @rfru

[jelbourn]

@doctorrustynelson forgot one last thing: can you squash your commits into one? The commit message should be something like

feat(radio): support ngModel

Thanks!

[doctorrustynelson]

@jelbourn Thank you for all the suggestions; I have done as requested and squashed the commits.

[jelbourn]

LGTM

[jelbourn]

Thanks for your contribution!

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