Remove leftover Fmt() PHP4 constructor
Use config.php to handle add-on information
Move lookup API into the add-on folder

Move the PHP proxy for looking up a zip code into the add-on folder rather
than leaving it in the helpers folder. This consolidates all of the PHP
code into a single place.

To do this, add an extension to the plugin that exposes an API at
/geozip-api/XXXXX for the JavaScript to use.
Merge pull request #1 from bryanburgers/feature/api

Move lookup API into the add-on folder