Added Examples to README

Author: ClickerMonkey

README.md

@@ -7,3 +7,47 @@
 - Bower: `bower install anim8js-scrollmagic`
 - Node: `npm install anim8js-scrollmagic`
 - Download: [anim8js-scrollmagic](https://raw.githubusercontent.com/anim8js/anim8js-scrollmagic/master/build/anim8js-scrollmagic.js)
+
+### Examples
+```javascript
+new ScrollMagic.Scene({triggerElement: '#trigger', duration: '100%'})
+  .addTo( controller )
+  // Triggered when transitioning from outside to inside scene
+  .enter(function() {
+    this.animator('#element', function() {
+      this.play('tada'); // ANY functions on animator
+    });
+    // this.animators
+    // this.movie
+    // this.player
+  })
+  // Triggered when transitioning from inside to outside scene
+  .exit(function() {
+    this.animator('#element', function() {
+      this.transition('2s', 'rollOut');
+    });
+  })
+  // Triggered when going from inside scene to BEFORE scene
+  .before(function() {
+    this.animators('#letters', function() {
+      this.sequence( 100 ).play('fadeIn'); // ANY functions on animators
+    });
+  })
+  // Triggered when going from inside scene to AFTER scene
+  .after(function() {
+    this.movie( movie, function() {
+      this.play(); // ANY functions on MoviePlayer
+    });
+  })
+  // Triggered while in scene - the calls are interpolated while scrolling
+  .during(function() {
+    this.animator('#box', function() {
+      this.play('wiggle');
+    });
+  })
+  // A short cut to a single call
+  .animate('during', 'animator', '#box', 'play', 'wiggle')
+  // Switch the direction of the scene
+  .setBackwards( true )
+;
+```

build/anim8js-scrollmagic.js

@@ -61,7 +61,15 @@ Scene.onProgress = function(callback)
   var instance = this;
   var invokeCallback = function()
   {
-    callback.call( instance, instance.state(), instance.progress() );
+    var state = instance.state();
+    var progress = instance.progress();
+
+    if (instance.backwards)
+    {
+      progress = 1.0 - progress;
+    }
+
+    callback.call( instance, state, progress );
   };
 
   instance.on( 'progress.anim8js', invokeCallback );