initial attempt at bee boxes

![image](https://cloud.githubusercontent.com/assets/1767466/3321599/c1b8b0be-f739-11e3-86e9-4f2ff2671b25.png)

Initial attempt to add boxes for spelling bee word.  Has a couple issues:
(1) I've used buttons for the boxes, as this seemed like the easiest way to get a consistent look.  I suspect there's a better approach.
(2) If you start spelling a really long incorrect word, the box will get larger to fit the text.  Not sure if it might be better to have text get smaller to fit the box.  Also not sure if that's something that's easy to do.
You might also need to override the button's cursor to a non-pointer value