Added a new position API "getLocation"

This returns as soon as a "accurate enough" position is reported or a
timeout is met. For use where you want to get a user position but don't
want to subscribe to a feed of location updates.
Updated RTI card to use new getLocation method
Typo and renamed variable for clarrification
Added documentation for the geolocation APIs
Added this accidentally
Merge pull request #29 from ox-it/refactor-geolocation

Get Location without subscribing