require velocity only on client, make a stub on server

Author: matijagaspar

src/QueueAnim.jsx

@@ -1,6 +1,21 @@
 import React, { createElement, cloneElement } from 'react';
 import { findDOMNode } from 'react-dom';
-import velocity from 'velocity-animate';
+
+let velocity
+if (typeof document !== 'undefined' && typeof window !== 'undefined') {
+    // only load velocity on the client
+    velocity = require('velocity-animate')
+
+} else {
+    // provide a velocity stub for the server
+    _velocityAnimate = function velocityServerDummy () {
+        var callback = arguments[arguments.length - 1]
+        // call after stack flushes
+        // in case you app depends on the asyncron nature of this function
+        setImmediate(function () { callback() })
+    }
+}
+
 import {
   toArrayChildren,
   findChildInChildrenByKey,