Update bower.json for Polymer elements and add PRESUBMIT.py

third_party/polymer/v1_0/components/neon-animation/README.md

 # neon-animation
 
 `neon-animation` is a suite of elements and behaviors to implement pluggable animated transitions for Polymer Elements using [Web Animations](https://w3c.github.io/web-animations/).
 
 *Warning: The API may change.*
 
 * [A basic animatable element](#basic)
 * [Animation configuration](#configuration)
   * [Animation types](#configuration-types)
   * [Configuration properties](#configuration-properties)
@@ skipping 83 matching lines @@
   },
   show: function() {
     this.opened = true;
     this.style.display = 'inline-block';
     // run scale-up-animation
     this.playAnimation('entry');
   },
   hide: function() {
     this.opened = false;
     // run fade-out-animation
-    this.playAnimation('fade-out-animation');
+    this.playAnimation('exit');
   },
   _onNeonAnimationFinish: function() {
     if (!this.opened) {
       this.style.display = 'none';
     }
   }
 });
 ```
 
 [Live demo](http://morethanreal.github.io/neon-animation-demo/bower_components/neon-animation/demo/doc/types.html)
@@ skipping 180 matching lines @@
  * `cascaded-animation` Applys an animation to an array of elements with a delay between each.
 
 <a name="demos"></a>
 ## Demos
 
  * [Grid to full screen](http://morethanreal.github.io/neon-animation-demo/bower_components/neon-animation/demo/grid/index.html)
  * [Animation on load](http://morethanreal.github.io/neon-animation-demo/bower_components/neon-animation/demo/load/index.html)
  * [List item to detail](http://morethanreal.github.io/neon-animation-demo/bower_components/neon-animation/demo/list/index.html) (For narrow width)
  * [Dots to squares](http://morethanreal.github.io/neon-animation-demo/bower_components/neon-animation/demo/tiles/index.html)
  * [Declarative](http://morethanreal.github.io/neon-animation-demo/bower_components/neon-animation/demo/declarative/index.html)