Add a synchronous example

It demonstrates calling tick() without setInterval or setTimeout
like in the other examples. Testing this is important because in
version 2.0.0 synchronous calls to tick() seem to prevent the bar
from rendering, see issue #170.

Author: Marco Brack

examples/iterative.js

@@ -0,0 +1,13 @@
+/**
+ * A simple progressbar with synchronous calls to tick()
+ * (i.e. no setTimeout/setInterval)
+ */
+
+var ProgressBar = require('../');
+
+var len = 10000000; // Adjust to your machine's speed
+var bar = new ProgressBar('[:bar]', len);
+
+for (var i = 0; i <= len; i++) {
+  bar.tick();
+}

lib/node-progress.js

@@ -93,15 +93,11 @@ ProgressBar.prototype.tick = function(len, tokens){
   this.curr += len
 
   // schedule render
-  if (this.renderThrottle === 0) {
-    this.render();
-  } else if (!this.renderThrottleTimeout) {
-    this.renderThrottleTimeout = setTimeout(this.render.bind(this), this.renderThrottle);
-  }
+  this.render();
 
   // progress complete
   if (this.curr >= this.total) {
-    if (this.renderThrottleTimeout) this.render();
+    this.render();
     this.complete = true;
     this.terminate();
     this.callback(this);