IAPage.js - unescape UTF8 chars in attribution

@russellholt @jagtalon 

![screen shot 2014-12-06 at 18 18 38](https://cloud.githubusercontent.com/assets/3652195/5508419/086f7502-87ad-11e4-82f8-962ffe79524a.png)

why not do this as a handlebars helper function instead of going through the attributions twice