add style for actor tiles

render actors got from backend
backend test code to get actors

src/elements/Preview/Preview.js

@@ -64,10 +64,8 @@ class Preview extends React.Component {
     itemClick() {
         console.log('item clicked!' + this.state.name);
 
-        this.props.viewbinding.changeRootElement(
-            <Player
-                viewbinding={this.props.viewbinding}
-                movie_id={this.props.movie_id}/>);
+        GlobalInfos.getViewBinding().changeRootElement(
+            <Player movie_id={this.props.movie_id}/>);
     }
 }
 

src/elements/Preview/Previw.test.js

@@ -20,13 +20,7 @@ describe('<Preview/>', function () {
         const func = jest.fn();
 
         const wrapper = shallow(<Preview/>);
-        wrapper.setProps({
-            viewbinding: {
-                changeRootElement: () => {
-                    func();
-                }
-            }
-        });
+        prepareViewBinding(func);
 
         wrapper.find('.videopreview').simulate('click');