Change overall design

I made some changes here and there which I think make the app look more beautiful. I don't know if it was ok for me to alter the app this much but I thought I'd make it and present it rather than first asking for permission. If you don't like it you can always just close the pull request anyway.

Preview:
![preview](https://f.cloud.github.com/assets/2550945/2365820/efd7e3a6-a6e0-11e3-9a50-b89201060289.gif)