Change the name of Component.render to Component.build in Effen

sky/examples/fn/widgets/floating_action_button.dart

 part of widgets;
 
 class FloatingActionButton extends MaterialComponent {
   static final Style _style = new Style('''
     position: absolute;
     bottom: 16px;
     right: 16px;
     z-index: 5;
     transform: translateX(0);
     width: 56px;
@@ skipping 12 matching lines @@
     top: 0;
     left: 0;
     right: 0;
     bottom: 0;
     -webkit-clip-path: circle(28px at center);''');
 
   Node content;
 
   FloatingActionButton({ Object key, this.content }) : super(key: key);
 
-  Node render() {
-    List<Node> children = [super.render()];
+  Node build() {
+    List<Node> children = [super.build()];
 
     if (content != null)
       children.add(content);
 
     return new Container(
       key: "Container",
       style: _style,
       children: [
         new Container(
           key: "Clip",
           style: _clipStyle,
           children: children
         )
       ]
     );
   }
 }