Display values for captured value dice, take 2

Fixes #389.

Although the code is complete, this pull request is currently incomplete, since I need a hand working out how to add the appropriate QUnit tests. My attempt can be seen in my branch 389_with_QUnit_tests, but for some reason (I'm probably missing something), I don't seem to be able to load the Game object.

Once I work out how to add the QUnit tests correctly, I'll merge that branch into this one and do a Jenkins run.
Nit: i'm surprised this is necessary, and it makes the code harder to read.  But i'm often surprised by what's necessary in JS, so i'm not going to hold the pull over it, just expressing surprise.