fixed value capture for radio, added default

Author: ghelton

src/directives/formly-field-radio.html

@@ -9,7 +9,8 @@
 			<input type="radio"
 				   name="{{id}}"
 				   id="{{id + '_'+ $index}}"
-				   ng-value="option.value">
+				   ng-value="option.value"
+				   ng-model="$parent.value">
 			{{option.name}}
 		</label>
 	</div>

src/views/home.js

@@ -16,6 +16,7 @@ app.controller('home', function($scope, $parse, $rootScope) {
 	}, {
 		type: 'radio',
 		label: 'Have you tried EmberJs yet?',
+		default: 'no',
 		options: [
 			{
 				name: 'Yes, and I love it!',