Added a timeout to prevent resizeBoxes from firing a billion times

I was running into an issue where I had 20 readmore boxes on a single page and the resizing event was firing a TON of times (there are a lot more purple event bars if I let the recorder continue).

![resize event craziness](https://cloud.githubusercontent.com/assets/371892/3758732/19ec5160-184f-11e4-97c2-d860fdae670e.png)

By setting a timeout (and using $proxy to retain 'this'), I was able to significantly decrease the number of events and speed up the page rendering a ton. There are still 20 rendering blocks (one for each redmore) but it's a big improvement.

![slightly less craziness](https://cloud.githubusercontent.com/assets/371892/3758744/4584cd3e-184f-11e4-89c3-21a05ddb68a8.png)