IE7 input change events

[alexrudall]

Hi, thanks for the excellent plugin which I find very useful! Something I'm having an issue with is that stickit does not seem to catch change events on input elements in IE7 until focus is lost. Would it make sense to listen for keyup events too? This resolves the issue for me in IE7.

https://github.com/alexrudall/backbone.stickit/blob/a507f94ab800b40cb039181c2ffc8e08c6e682ae/backbone.stickit.js#L443

Many thanks.