Implements the Weatherzone date-based rolling key for accessing the API.
The Wetherzone API uses a custom rolling key for authentication. This rolling key is valid for 48 hours of the date in question and should be regenerated each day.
The key is defined as a MD5summed hash of the salt and key concatenated.
The salt is a number defined as the sum of day×2, month×300, year×1700000.
Install wzkeygen as a NPM module, then:
var wzkeygen = require('wzkeygen');
var myKey = wzKeygen('mypassword');
This is really simple but please feel free to submit a pull request if this doesn't work for you.