Fixes #43: parent signature clause only shows up if registrant is under 18
Fixes #45: Added Paid column to expense summary

I couldn't decide if we wanted the X (&#x2717;) for the non-paid items
or not. It add's visual continuity, but it doesn't make it as
strikingly obvious what is and isn't paid.
Working on issue #47

This is better than it was, but the color fix doesn't work in gmail.
Add autocomplete (Canada or United States) to the 'Country' Field of registration form
Add option allowing 'autocomplete' of text event_choices. Closes #40.
Merge remote-tracking branch 'scott/master'