fix(ionRadio): fix ng-change being reported before model changes

Closes #1741

BREAKING CHANGE:

ion-radio no longer has an isolate scope.
This will break your radio only if you were relying upon the radio having an isolate scope: if you were referencing `$parent.value` as
the ng-disabled attribute, for example.

Change your code from this:

<ion-radio ng-disabled="{{$parent.isDisabled}}"></ion-radio>

To this:

<ion-radio ng-disabled="{{isDisabled}}"></ion-radio>

js/angular/directive/radio.js

@@ -22,25 +22,30 @@ IonicModule
     restrict: 'E',
     replace: true,
     require: '?ngModel',
-    scope: {
-      ngModel: '=?',
-      ngValue: '=?',
-      ngDisabled: '=?',
-      ngChange: '&',
-      icon: '@',
-      name: '@'
-    },
     transclude: true,
-    template: '<label class="item item-radio">' +
-                '<input type="radio" name="radio-group"' +
-                ' ng-model="ngModel" ng-value="getValue()" ng-change="ngChange()" ng-disabled="ngDisabled">' +
-                '<div class="item-content disable-pointer-events" ng-transclude></div>' +
-                '<i class="radio-icon disable-pointer-events icon ion-checkmark"></i>' +
-              '</label>',
+    template:
+      '<label class="item item-radio">' +
+        '<input type="radio" name="radio-group">' +
+        '<div class="item-content disable-pointer-events" ng-transclude></div>' +
+        '<i class="radio-icon disable-pointer-events icon ion-checkmark"></i>' +
+      '</label>',
 
     compile: function(element, attr) {
-      if(attr.name) element.children().eq(0).attr('name', attr.name);
       if(attr.icon) element.children().eq(2).removeClass('ion-checkmark').addClass(attr.icon);
+      var input = element.find('input');
+      forEach({
+          'name': attr.name,
+          'value': attr.value,
+          'disabled': attr.disabled,
+          'ng-value': attr.ngValue,
+          'ng-model': attr.ngModel,
+          'ng-disabled': attr.ngDisabled,
+          'ng-change': attr.ngChange
+      }, function(value, name) {
+        if (isDefined(value)) {
+            input.attr(name, value);
+          }
+      });
 
       return function(scope, element, attr) {
         scope.getValue = function() {