Split Opinions Insight

Hi,

As we discussed on the mailing list I've changed this insight to highlight videos with a 40-60% split in likes / dislikes.

![screenshot from 2013-08-22 18 37 06](https://f.cloud.github.com/assets/851569/1010862/d5f170fe-0b51-11e3-9544-7631d28bddc4.png)