Subscriber change insight

Hi,

This insight highlights videos which cause a large change in subscribers either an increase or decrease.

The insight is displayed as text with a bar chart showing your subscribers before and after this video.

![screenshot from 2013-08-22 16 09 09](https://f.cloud.github.com/assets/851569/1009841/819f3d90-0b3f-11e3-81f9-9634c47ac358.png)