BREAKING CHANGE: $ionicScrollDelegate no longer works globally; you must
create a new instance of each time you use it. The actual methods on
each instance of $ionicScrollDelegate are the same, however.
Change your code from this:
```js
function MyController($scope, $ionicScrollDelegate) {
$scope.scrollTop = function() {
$ionicScrollDelegate.scrollTop();
};
}
```
To this:
```js
function MyController($scope, $ionicScrollDelegate) {
var delegate = $ionicScrollDelegate($scope);
$scope.scrollTop = function() {
delegate.scrollTop();
};
}
```
Adds new '$ionicBind' service, which takes an object containing
binding definitions (similar to angular directive isolate scope
definition). Allows binding of any directive attribute & expressions
from a scope, letting us do normal attribute -> scope binding
without having to create isolate scopes.
Closes#555. Closes#669
BREAKING CHANGE: All directives are now prefixed with `ion-`.
For any directive you use, add the ionic prefix.
For example, change this HTML:
```html
<tabs>
<tab title="home" href="/tab/home">
<content>Hello!</content>
</tab>
</tabs>
```
To this HTML:
```
<ion-tabs>
<ion-tab title="home" href="/tab/home">
<ion-content>Hello!</ion-content>
</ion-tab>
</ion-tabs>
```
Scrolls to the location of element with id matching $location.hash(). If
$location.hash() is blank or the id does not exist, it will scroll to
the top.
