ui: improved on 13" plus complete overhaul

the UI now looks fantastic on a 13"

before:
https://www.dropbox.com/s/jmibncgmsbic4rs/Screenshot%202014-08-19%2018.25.38.png

after:
https://www.dropbox.com/s/iv5k10bepfo3vob/Screenshot%202014-08-19%2018.26.10.png

should probably be checked on a larger display to make sure the media queries work ok, but it looks nice on my retina with the different resolutions.