Add labels to buttons
Move menu to let block, change radio buttons xpath to group them together
Second test for SinatraApp. Also switch order of Game.new parameters
Pass parameters to Game.start.  Also add sinatra error message output for debugging
Refactor SinatraApp, add another test
Add BrowserIO#show
Second test for BrowserIO.show
Finish BrowserIO.show
Refactor BrowserIO.show and wrap in <pre> tags
Refactor SinatraApp
Some refactoring

I was originally going to make the updates to the board using ajax
requests, but I'm not quite sure how I'd get the javascript to
communicate with my application, so I'm using form submissions to
communicate with Sinatra.
Add form for input
Add post method to handle input