update todo, add 'required' attribute to the new 'free t-shirt' field
add back the links on the registrants#show page that were removed for NAUCC 2013, now that we have figured out a way to use the pdf.css to hide certain elements on pdf printing
add 'free item' to the #items page
update the event_configuration page(s) to try to make it a more pleasant experience
update todo.txt
add ability to specify a tax_percentage on each expense_item
allow taxes to be fractions of a percent, round tax to the next-highest cent
Add ability to choose 'I want to volunteer' on the registration page