refactor(ngSwitch): remove undocumented change attribute from ngSwitch

BREAKING CHANGE:

Ever since 0df93fd, tagged in v1.0.0rc1, the ngSwitch directive has had an undocumented `change`
attribute, used for evaluating a scope expression when the switch value changes.

While it's unlikely, applications which may be using this feature should work around the removal
by adding a custom directive which will perform the eval instead. Directive controllers are
re-instantiated when being transcluded, so by putting the attribute on each item that you want
to be notified of a change to, you can more or less emulate the old behaviour.

Example:

```js
angular.module("switchChangeWorkaround", []).
  directive("onSwitchChanged", function() {
    return {
      linke: function($scope, $attrs) {
        $scope.$parent.$eval($attrs.change);
      }
    };
  });
```

```html
<div ng-switch="switcher">
  <div ng-switch-when="a" on-switch-changed="doSomethingInParentScope()"></div>
  <div ng-switch-when="b" on-switch-changed="doSomethingInParentScope()"></div>
</div>
```

Closes #8858
Closes #8822

src/ng/directive/ngSwitch.js

@@ -165,7 +165,6 @@ var ngSwitchDirective = ['$animate', function($animate) {
         selectedScopes.length = 0;
 
         if ((selectedTranscludes = ngSwitchController.cases['!' + value] || ngSwitchController.cases['?'])) {
-          scope.$eval(attr.change);
           forEach(selectedTranscludes, function(selectedTransclude) {
             selectedTransclude.transclude(function(caseElement, selectedScope) {
               selectedScopes.push(selectedScope);

test/ng/directive/ngSwitchSpec.js

@@ -208,19 +208,6 @@ describe('ngSwitch', function() {
     expect(element.text()).toEqual('236');
   }));
 
-
-  it('should call change on switch', inject(function($rootScope, $compile) {
-    element = $compile(
-      '<ng:switch on="url" change="name=\'works\'">' +
-        '<div ng-switch-when="a">{{name}}</div>' +
-      '</ng:switch>')($rootScope);
-    $rootScope.url = 'a';
-    $rootScope.$apply();
-    expect($rootScope.name).toEqual('works');
-    expect(element.text()).toEqual('works');
-  }));
-
-
   it('should properly create and destroy child scopes', inject(function($rootScope, $compile) {
     element = $compile(
       '<ng:switch on="url">' +