Validate EC name regardless of country

There's no reason to stop requiring an emergency contact name just
because someone's international. Moved the block to the right place.
Automatically check international checkbox

Ubersystem tries to validate information based on US standards unless
the "international" checkbox is checked. Since this checkbox is
unnecessary when collecting the full address, it is hidden and changed
based on the Country field.
Hide comments field

Hides the comments field behind COLLECT_INTERESTS, because it's a
temporary measure and we don't need ten config options to rip out later.
Merge pull request #657 from magfest/fix_international_checkbox

Fix international checkbox
Merge pull request #660 from magfest/hide_comments

Hide comments field
Fix merge conflicts