Add database column for message. Some hard coding for username atm.
Add comment box and update thymeleaf version
Extract user name via JSON
Add functionality for admins to remove students from a queue
Adding logout button and logout method
Merge pull request #14 from mvk13ogb/admin-remove-student

Add functionality for admins to remove students from a queue
Minor changes to previous logout commit
Added help.html and button
minor changes to original pull request
Merge pull request #16 from mvk13ogb/helpsection

Added help.html and button
Switch to using thymeleaf for getting username
Fix conflicts for merge with master
Change to real logout buttons
Switch to logout with CAS filter
Merge pull request #15 from mvk13ogb/logout

Adding logout button and logout method
Clean up security code a bit
Make it possible in the back-end for an owner of a queue position to un-queue
Make the "Remove" button show up for queue positions you own
Disable custom error page (useful for development)
Hide form instead of table cell when Remove button is absent