Display values for captured value dice

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.