Show users that have voted on a requirement
So yeah, we have an arrayList of DefaultListModel<String>, one for each requirement.  It switches which is displayed when you switch requirements, and when you submit for the first time your username is added to the appropriates list

Committed by: ajthompson
Merge pull request #432 from ajthompson/show-users

Show users that have voted on a requirement
Merge branch 'sbl-dev' of git://github.com/struct-by-lightning/wpi-suite into sbl-dev