requires f38d490886
- adds `lib/geolocation.js` with `getGeolocationFromIP()` function which uses https://geojs.io to lookup geolocation data from an IPv4 or IPv6 address
- updates `create/updateMember()` functions to work with a `geolocation` property in the passed in object
- if `geolocation` is `undefined` when updating a member do not reset any existing property
- updates `sendMagicLink` middleware to extract the IP address from the request and stores it as part of the token payload
- updates `getMemberDataFromMagicLinkToken()` method to extract the IP address from the token payload and perform a geolocation lookup if we have an IP address and a matching member does not already have geolocation data
