add an onFinished event to complement onClear; rearrange slightly so …

…you don't get both when clearing

timeframe.js

@@ -443,10 +443,13 @@ var Timeframe = Class.create({
     if (!this.dragging) return;
     if (!this.stuck) {
       this.dragging = false;
-      if (event.findElement('span.clear span.active'))
-        this.clearRange();
       if (this.timer)
         clearInterval(this.timer);
+      if (event.findElement('span.clear span.active')) {
+        this.clearRange();
+      } else {
+        if (this.options.keys().include('onFinished')) this.options.get('onFinished')();
+      }
     }
     this.mousedown = false;
     this.refreshRange();