feat(ionScroll): add has-bouncing=true/false attribute

Closes #1573. Closes #1367.

js/angular/directive/scroll.js

@@ -19,6 +19,8 @@
  * @param {boolean=} zooming Whether to support pinch-to-zoom
  * @param {integer=} min-zoom The smallest zoom amount allowed (default is 0.5)
  * @param {integer=} max-zoom The largest zoom amount allowed (default is 3)
+ * @param {boolean=} has-bouncing Whether to allow scrolling to bounce past the edges
+ * of the content.  Defaults to true on iOS, false on Android.
  */
 IonicModule
 .directive('ionScroll', [
@@ -70,6 +72,7 @@ function($timeout, $controller, $ionicBind) {
         var scrollViewOptions= {
           el: $element[0],
           delegateHandle: $attr.delegateHandle,
+          bouncing: $scope.$eval($attr.hasBouncing),
           paging: isPaging,
           scrollbarX: $scope.$eval($scope.scrollbarX) !== false,
           scrollbarY: $scope.$eval($scope.scrollbarY) !== false,

test/unit/angular/directive/scroll.unit.js

@@ -20,6 +20,11 @@ describe('Ionic Scroll Directive', function() {
       .toBe('handleThis');
   });
 
+  it('passes hasBouncing attribute', function() {
+    var el = compile('<ion-scroll has-bouncing="123">')(scope);
+    expect(el.controller('$ionicScroll')._scrollViewOptions.bouncing).toEqual(123);
+  });
+
   it('has $onScroll (used by $ionicScrollController)', function() {
     element = compile('<ion-scroll on-scroll="foo()"></ion-scroll>')(scope);
     scope = element.scope();