Fix for jQuery 1.9.0

jQuery 1.9.0 doesn't have the $.event.handle property, so you need to use jQuery's API.

https://github.com/paulirish/infinite-scroll/commit/3c571e2d2cd3f1444b3b172fd4dbe17722296f22
Merge pull request #1 from nicofuchs/master

Fix for jQuery 1.9.0