Update spin.js.

assets/spin-js/README.md

@@ -0,0 +1,21 @@
+# spin.js [![JS.ORG](https://img.shields.io/badge/js.org-spin-ffb400.svg?style=flat-square)](http://js.org)
+
+An animated CSS3 loading spinner with VML fallback for IE.
+
+ * No images, no external CSS
+ * No dependencies
+ * Highly configurable
+ * Resolution independent
+ * Uses VML as fallback in old IEs
+ * Uses @keyframe animations, falling back to setTimeout()
+ * Works in all major browsers, including IE6
+ * Small footprint (~1.9K gzipped)
+ * MIT License
+
+## Usage
+
+```javascript
+new Spinner({color:'#fff', lines: 12}).spin(target);
+```
+
+For an interactive demo and a list of all supported options please refer to the [project's homepage](http://spin.js.org).