Adds a workaround for missing addEventListener in IE8

For me this was not working in IE8, throwing an `Object doesn't support this property or method` error. 

According to http://stackoverflow.com/questions/1695376/msie-and-addeventlistener-problem-in-javascript, that's because IE8 doesn't implement addEventListener, which is used on [line 536](https://github.com/HenrikJoreteg/ICanHaz.js/blob/master/ICanHaz.js#L536).

I implemented the workaround suggested on that Stack Overflow question, and the error went away. I only changed the pre-minified code.