[CSS] Minor change to the table styling to align items using middle, rat...

Minor change to the table styling to align items using 'middle', rather than 'top'. 

Here is before: https://www.dropbox.com/s/iribmeaf6w50i42/Screenshot%202014-02-11%2014.42.09.png and here is after: https://www.dropbox.com/s/hg4eyo20x0gg87s/Screenshot%202014-02-11%2014.41.29.png

It's a small change but I think it helps quite a bit.