Closes#1349, #1741
BREAKING CHANGE:
ion-toggle no longer has an isolate scope.
This will break your toggle only if you were relying upon the toggle
having an isolate scope: if you were referencing `$parent.value` as
the ng-disabled attribute, for example.
Change your code from this:
<ion-toggle ng-disabled="{{$parent.isDisabled}}"></ion-toggle>
To this:
<ion-toggle ng-disabled="{{isDisabled}}"></ion-toggle>
