add node modules to repo

node_modules/throttleit/example.js

@@ -0,0 +1,14 @@
+
+var throttle = require('./');
+
+function onprogress(n) {
+  console.log('progress %s%', n);
+}
+
+onprogress = throttle(onprogress, 500);
+
+var n = 0;
+setInterval(function(){
+  if (n >= 100) return;
+  onprogress(n++);
+}, 50);