support Bootstrap3 and resize columns

Hi Alec, thank you and your great scrollable-table! The fixed header and sort feature are very useful! Based on my project requirement, I added resizing columns feature and upgrade Bootstrap to version 3. please take a look at code, you can find a demo from http://jsfiddle.net/Gary_Li/T9Wek/. If they make sense to your project, that's would be my pleasure :)