Added .resizeBoxes() to window.onload on init

I had the "text being cut off" problem in Issue #51 and I noticed that it resolved itself once I resized the browser. So, until someone figures out the height issue, I'm working around it by calling resizeBoxes() as soon as the window loads.
Note: I am also calling Readmore.js on a div that has one of Bootstrap's .col-* classes extended into it, in case that information is useful to anyone.