Zone implementation.

* Implemented ZoneMembers, a joined table with all entries
    * Country
    * State
    * Province
    * City
    * PostalCode
* ZoneManager: Populate zones
* ZoneFinder: Find zones given members
* ZoneMatcher: Check if memeber is in a zone
* Tested
Merge pull request #260 from elcodi/feature/geo-zone-infrastructure

Zone implementation.