feat(uiView) autoscroll attribute

Adds an `autoscroll="expr"` attribute to `uiView` just like
`ngInclude` has, with the difference that if the `autoscroll`
attribute isn't defined then the scroll will happen in order to not
break the current behavior.

src/viewDirective.js

@@ -123,7 +123,9 @@ function $ViewDirective(   $state,   $compile,   $controller,   $injector,   $an
 
           // TODO: This seems strange, shouldn't $anchorScroll listen for $viewContentLoaded if necessary?
           // $anchorScroll might listen on event...
-          $anchorScroll();
+          if (!angular.isDefined(attr.autoscroll) || scope.$eval(attr.autoscroll)) {
+            $anchorScroll();
+          }
         }
       };
     }

test/viewDirectiveSpec.js

@@ -17,6 +17,12 @@ describe('uiView', function () {
 
   beforeEach(module('ui.router'));
 
+  beforeEach(module(function ($provide) {
+    $provide.decorator('$anchorScroll', function ($delegate) {
+       return jasmine.createSpy('$anchorScroll');
+    });
+  }));
+
   var aState = {
     template: 'aState template'
   },
@@ -209,4 +215,27 @@ describe('uiView', function () {
     }));
   });
 
+  describe('autoscroll attribute', function () {
+    it('should autoscroll when missing', inject(function ($state, $q, $anchorScroll) {
+      elem.append($compile('<div ui-view></div>')(scope));
+      $state.transitionTo(gState);
+      $q.flush();
+      expect($anchorScroll).toHaveBeenCalled();
+    }));
+
+    it('should autoscroll when truthy', inject(function ($state, $q, $anchorScroll) {
+      elem.append($compile('<div ui-view autoscroll="true"></div>')(scope));
+      $state.transitionTo(gState);
+      $q.flush();
+      expect($anchorScroll).toHaveBeenCalled();
+    }));
+
+    it('should not autoscroll when falsy', inject(function ($state, $q, $anchorScroll) {
+      elem.append($compile('<div ui-view autoscroll="false"></div>')(scope));
+      $state.transitionTo(gState);
+      $q.flush();
+      expect($anchorScroll).not.toHaveBeenCalled();
+    }));
+  });
+
 });