touch ./animations (#148)

* Update project structure using flutter create and remove unused tests
* Small updates to main.dart
* Update maintenance.md
* Add missing newline
* Add rudimentary test
* Apply formatting

animations/lib/main.dart

@@ -25,35 +25,65 @@ class Demo {
   final String route;
   final WidgetBuilder builder;
 
-  const Demo(this.name, this.route, this.builder);
+  const Demo({this.name, this.route, this.builder});
 }
 
 final basicDemos = [
-  Demo('AnimatedContainer', AnimatedContainerDemo.routeName,
-      (context) => AnimatedContainerDemo()),
-  Demo('PageRouteBuilder', PageRouteBuilderDemo.routeName,
-      (context) => PageRouteBuilderDemo()),
-  Demo('Animation Controller', AnimationControllerDemo.routeName,
-      (context) => AnimationControllerDemo()),
-  Demo('Tweens', TweenDemo.routeName, (context) => TweenDemo()),
-  Demo('AnimatedBuilder', AnimatedBuilderDemo.routeName,
-      (context) => AnimatedBuilderDemo()),
-  Demo('Custom Tween', CustomTweenDemo.routeName,
-      (context) => CustomTweenDemo()),
-  Demo('Tween Sequences', TweenSequenceDemo.routeName,
-      (context) => TweenSequenceDemo()),
+  Demo(
+      name: 'AnimatedContainer',
+      route: AnimatedContainerDemo.routeName,
+      builder: (context) => AnimatedContainerDemo()),
+  Demo(
+      name: 'PageRouteBuilder',
+      route: PageRouteBuilderDemo.routeName,
+      builder: (context) => PageRouteBuilderDemo()),
+  Demo(
+      name: 'Animation Controller',
+      route: AnimationControllerDemo.routeName,
+      builder: (context) => AnimationControllerDemo()),
+  Demo(
+      name: 'Tweens',
+      route: TweenDemo.routeName,
+      builder: (context) => TweenDemo()),
+  Demo(
+      name: 'AnimatedBuilder',
+      route: AnimatedBuilderDemo.routeName,
+      builder: (context) => AnimatedBuilderDemo()),
+  Demo(
+      name: 'Custom Tween',
+      route: CustomTweenDemo.routeName,
+      builder: (context) => CustomTweenDemo()),
+  Demo(
+      name: 'Tween Sequences',
+      route: TweenSequenceDemo.routeName,
+      builder: (context) => TweenSequenceDemo()),
 ];
 
 final miscDemos = [
-  Demo('Expandable Card', ExpandCardDemo.routeName,
-      (context) => ExpandCardDemo()),
-  Demo('Carousel', CarouselDemo.routeName, (context) => CarouselDemo()),
-  Demo('Focus Image', FocusImageDemo.routeName, (context) => FocusImageDemo()),
-  Demo('Card Swipe', CardSwipeDemo.routeName, (context) => CardSwipeDemo()),
-  Demo('Repeating Animation', RepeatingAnimationDemo.routeName,
-      (context) => RepeatingAnimationDemo()),
-  Demo('Spring Physics', PhysicsCardDragDemo.routeName,
-      (context) => PhysicsCardDragDemo()),
+  Demo(
+      name: 'Expandable Card',
+      route: ExpandCardDemo.routeName,
+      builder: (context) => ExpandCardDemo()),
+  Demo(
+      name: 'Carousel',
+      route: CarouselDemo.routeName,
+      builder: (context) => CarouselDemo()),
+  Demo(
+      name: 'Focus Image',
+      route: FocusImageDemo.routeName,
+      builder: (context) => FocusImageDemo()),
+  Demo(
+      name: 'Card Swipe',
+      route: CardSwipeDemo.routeName,
+      builder: (context) => CardSwipeDemo()),
+  Demo(
+      name: 'Repeating Animation',
+      route: RepeatingAnimationDemo.routeName,
+      builder: (context) => RepeatingAnimationDemo()),
+  Demo(
+      name: 'Spring Physics',
+      route: PhysicsCardDragDemo.routeName,
+      builder: (context) => PhysicsCardDragDemo()),
 ];
 
 final basicDemoRoutes =