UI refactor

Refactor of the game play UI, particularly:
* Make the UI less vertical so that things don't scroll off the page (addresses #348, IMO)
* Make the die circles smaller, make the numbers bigger, and move the recipes outside of the circles (addresses #323 and #183)
* Add button images to the UI (addresses #139, depending on what you think "various times" are --- during game play and after the game ends, are the two times i added it)
Jenkins: http://jenkins.buttonweavers.com:8080/job/buttonmen-cgolubi1/129/

Note that i listed all of those tickets as "addresses" rather than "fixes", because there are a lot of them, and i want to check with the ticket reporters before closing them.