[hydra] Add AutoEnableHemisphereTracking

The Razer Hydra requires the user to point each controller at the base
station while this method called to enable proper tracking below the
hydra base station.

See documentation of `sixenseAutoEnableHemisphereTracking` for more
information
Merge pull request #42 from Voxar/enableHemisphereTracking

[hydra] Add AutoEnableHemisphereTracking