NZD

Adds support for NZD

Incorrect dates

Fixes a number of issues where the start (and end) of a convention was detected wrong, making things look off.

Also some bugs with the new convention search were fixed.

Search By Country

Conventions can now be searched by country or city.

Also adds AUD, SEK, CNY, JPY, and PHP currencies

Convention-less sales

This update adds the ability to record sales independently of conventions.

It also adds the reminder to verify your email address.

Initial Release

This is not actually the initial release, but it's the first release I decided to make a tag for.